David Barsky

azul. Tiled transparency logs libraries and applications

pdb-operator. Intelligent Pod Disruption Budget Management for Kubernetes

buck2-fixups. Fixups for buck2

buffa. Rust implementation of protobuf with editions support, JSON serialization, and zero-copy views

actiond. A fully hermetic local "remote executor"

underway. ⏳ Durable step functions via Postgres.

lazydiff. A fast terminal UI for reviewing Git diffs with support for annotations for agents

dax. Cross-platform shell tools for Deno and Node.js inspired by zx.

s2. Durable Streams API

rskafka. A minimal Rust client for Apache Kafka

pgstream. PostgreSQL replication with DDL changes

hunk. Review-first terminal diff viewer for agentic coders

connect-rust. An implementation of the ConnectRPC protocol for Rust

tigerblock. Go package to interact with cloud object storage providers

jayjay. A native macOS GUI for Jujutsu (jj) — DAG graph, side-by-side diffs, interdiff, conflict resolution. Built with Rust + SwiftUI.

svelte-check-native. Blazing fast svelte-check (<1.0s) built with Rust

zentty. A native macOS terminal for agent-driven development, built on Ghostty.

stylex-swc-plugin. Rust/NAPI-RS/SWC compiler for StyleX CSS-in-JS — a faster, Babel-free replacement for @stylexjs/babel-plugin with plugins for Next.js, Vite, webpack, Rspack, Rollup, Turbopack, PostCSS, and Jest.

rattles. 🪇 Minimal terminal spinners/throbbers for Rust

otel-gui. A lightweight, local OpenTelemetry trace viewer

octodot. Fast, native keyboard-centric macOS menubar app for GitHub notifications

sem. Semantic version control => entity-level diffs, blame, and impact analysis on top of git. 28 languages via tree-sitter. Built for coding agents.

pgschema. Terraform-style, declarative Postgres schema migration. Agent friendly.

schemathesis. Catch API bugs before your users do

msi-kvm-switch. Rust

lightjj. Lightning-fast JJ UI

Essence-public. Essence - free native log viewer for Mac

pi_agent_rust. High-performance AI coding agent CLI written in Rust with zero unsafe code

asdbctl. Small command line utility to get/set the brightness of Apple Studio Displays from Linux

claude-devtools. The missing DevTools for Claude Code — inspect session logs, tool calls, token usage, subagents, and context window in a visual UI. Free, open source.

s3s. S3 Service Adapter

hunk. A GPUI based diff viewer and Codex orchestrator for vibe engineering

claude-code-config. Opinionated defaults, documentation, and workflows for Claude Code at Trail of Bits

pubgrub. PubGrub version solving algorithm implemented in Rust

jqueue. Python

pgroll. PostgreSQL zero-downtime migrations made easy

tracey. CLI, Web, LSP, and MCP toolkit to measure spec coverage in Rust codebases

squawk. 🐘 Linter for Postgres migrations & SQL

react-vello. Blazing fast React renderer powered by Vello

cossistant. Open-source, customer support platform with fully customizable AI support agents for developers / startups shipping SaaS.

gpuikit. gpui-kit is an (upcoming) open-source UI toolkit for gpui, the fast, native Rust GUI library.

react-three-fiber. 🇨🇭 A React renderer for Three.js

travels. A fast, framework-agnostic undo/redo core powered by Mutative JSON Patch

multigres. Vitess for Postgres

dis. DIS: blockDevice over Immutable Storage

steiger. High-performance container build orchestrator with native Bazel, Nix and Docker BuildKit

lauka. Apple Silicon PMU counter benchmark

yobo. Rust

dibs. Postgres toolkit for Rust, powered by facet reflection

tinys3. Extremely basic local-disk S3 implementation

ed3d-plugins. Ed's repo of Claude Code plugins, centered around a research-plan-implement workflow. Only a tiny bit cursed. If you're lucky.

Matryoshka. MCP server for token-efficient large document analysis via the use of REPL state

docket. Rust

typeslayer. you can't hide from TypeSlayer

dotsmatrixloading. Loading animations with dot matrix

react-scan. Scan and fix React performance issues

ShaderKit. A Swift package for composable Metal shaders and holographic UI effects in SwiftUI.

FSKitBridge. Connect macOS FSKit to a Rust/C/Go/Python backend via TCP.

jjui. jjui is a TUI designed for interacting with the Jujutsu version control system.

maplib. Rust

nemo. A fast in-memory rule engine

mir-semantics. Python

jjagent. track claude code sessions as jj-vcs changes

sqldef. Idempotent schema management for MySQL, PostgreSQL, SQLite, and SQL Server

ZeroFS. ZeroFS: A log-structured filesystem for S3. ZeroFS serves S3-compatible buckets as POSIX filesystems over NFS and 9P, or as raw block devices over NBD.

rsql. Command line SQL interface for relational databases and common data file formats

playwright-skill. Claude Code Skill for browser automation with Playwright. Model-invoked - Claude autonomously writes and executes custom automation for testing and validation.

ssoready. Open-source dev tools for enterprise SSO. Ship SAML + SCIM support this afternoon.

arborium. An opinionated tree-sitter + tree-sitter-highlight + grammars bundle

ELMo-Tune. [HotStorage'24 Best Paper] Can Modern LLMs Tune and Configure LSM-based Key-Value Stores?

cratographer. An MCP tool for indexing your Rust code to work with agents like Kiro CLI and Claude Code.

git-bug. Distributed, offline-first bug tracker embedded in git

golte. Render Svelte components in your Go http handlers.

s3lect. Leader election package for Go which uses S3/object storage as the primary coordination mechanism

kubert. Rust Kubernetes runtime helpers. Based on kube-rs.

pgx_ulid. Postgres extension for ulid

glamour. Stylesheet-based markdown rendering for your CLI apps 💇🏻‍♀️

pgmq. A lightweight message queue. Like AWS SQS and RSMQ but on Postgres.

ssr-rs. Server side rendering on rust servers using the v8 engine for parse and evaluate the JavaScript code.

kaffe-rs. Rust-based Markdown/React to HTML Transpiler

datastore-emulator. Rewrite of datastore emulator in Rust 🦀

typed-htmx. Definitions for htmx attributes

sxo. SXO is a multi-runtime server-side JSX tool for Node.js, Bun, Deno, and Cloudflare Workers. It includes SXOUI, a framework-agnostic UI library inspired by shadcn/ui

spicedb. Open Source, Google Zanzibar-inspired database for scalably storing and querying fine-grained authorization data

typed-html. TypeSafe HTML templates using TypeScript. No need to learn a template library.

tsidp. A simple OIDC / OAuth Identity Provider (IdP) server for your tailnet.

react-compiler-marker. Universal IDE extension that shows which React components are optimized by the React Compiler ✨

moonpool. Rust

aperf. An all-in-one CLI too for performance monitoring, analysis, and debugging.

torii-rs. Torii is a powerful authentication framework for Rust applications that gives you complete control over your users' data.

clorinde. Generate type-checked Rust from your PostgreSQL.

shellflip. Graceful process restarts in Rust

slidetty. cli slideshows

Forte. An async-compatible thread-pool written in rust.

dataloader-rs. Rust implementation of Facebook's DataLoader using async-await.

sequin. Postgres change data capture to streams, queues, and search indexes like Kafka, SQS, Elasticsearch, HTTP endpoints, and more

pgwire. PostgreSQL wire protocol implemented as a rust library.

postgres-language-server. A Language Server for Postgres

wikijump. The SCP Wiki's work on Project Foundation, a replacement for Wikidot.

tansu. Apache Kafka® compatible broker with S3, PostgreSQL, SQLite, Apache Iceberg and Delta Lake

reshape. An easy-to-use, zero-downtime schema migration tool for Postgres

pgdog. PostgreSQL connection pooler, load balancer and database sharder.

pgcat. PostgreSQL pooler with sharding, load balancing and failover support.

ripple. the elegant TypeScript UI framework

libcnb.rs. A framework for writing Cloud Native Buildpacks in Rust

pgrx. Build Postgres Extensions with Rust!

watson. a minimilistic web assembly parser, compiler, and interpreter for Rust

rari. rari: High-performance React Server Components framework powered by a Rust runtime, delivering 18.1x faster response times (0.12ms vs 2.17ms) and 67.4x higher throughput (97,826 vs 1,452 req/sec) than Next.js with zero-config setup.

tree-house. Cozy Rust bindings to the tree-sitter C library and a robust highlighter

assert-struct. A proc macro for asserting on the structure of Rust values.

jj-lsp. LSP to resolve conflicts in the jj-vcs

corrosion. Gossip-based service discovery (and more) for large distributed systems.

foca. mirror of https://caio.co/de/foca/

rudy. A Toolchain for Rust Debuginfo

jj-gpc. Generate bookmark names from commit messages, to push as branches, with Jujutsu VCS

buck2-rustc-bootstrap. Compile Rust compiler using Buck2

chili. Rust port of Spice, a low-overhead parallelization library

auto-lsp. A rust crate for creating AST and LSP servers powered by tree-sitter.

rustowl. Visualize Ownership and Lifetimes in Rust

corosensei. A fast and safe implementation of stackful coroutines in Rust

columnar. High-throughput columnar serialization in Rust

arbtest. A minimalist property-based testing library

venator. Venator: a desktop app for viewing logs and traces from OpenTelemetry and the Rust tracing ecosystem

cargo-modules. Visualize/analyze a Rust crate's internal structure

egui_graphs. Interactive graph visualization widget for rust powered by egui and petgraph

jj-yak. virtualized remote backend for JJ

ecow. Compact, clone-on-write vector and string.

strings. Rust String Libraries by mcyoung

papaya. A fast and ergonomic concurrent hashmap for read-heavy workloads.

haste. A framework for parallel incremental computation

syntree. A memory efficient syntax tree for language developers

buck2-change-detector. Given a Buck2 built project and a set of changes (e.g. from source control) compute the targets that may have changed. Sometimes known as a target determinator, useful for optimizing a CI system.

unfmt. Compile-time string pattern matching that reverses format! interpolation — a lightweight regex alternative with no runtime compilation cost

sema. A theme that focuses on what’s important

pale-fire. Port of Emacs Zenburn theme to VS Code

argus. An IDE extension for debugging trait errors in Rust.

dhat-rs. Heap profiling and ad hoc profiling for Rust programs.

ascent. Logic programming in Rust

gitu. A TUI Git client inspired by Magit

Timelane. Timelane

hot-lib-reloader-rs. Reload Rust code without app restarts. For faster feedback cycles.

cedar. Implementation of the Cedar Policy Language

diffsitter. A tree-sitter based AST difftool to get meaningful semantic diffs

mise. dev tools, env vars, task runner

serde_tokenstream. serde::Deserializer for proc_macro/proc_macro2::TokenStream

tom. tom: a format-preserving TOML parser in Rust

quint. An executable specification language with delightful tooling based on the temporal logic of actions (TLA)

cargo-remark. Cargo subcommand for viewing LLVM optimization remarks.

scout. Friendly fuzzy finder made with rust

skim. Fuzzy Finder in rust!

xorfilter. Rust library implementing xor-filters

typeshare. Typeshare is the ultimate tool for synchronizing your type definitions between Rust and other languages for seamless FFI.

comemo. Incremental computation through constrained memoization.

rye. a Hassle-Free Python Experience

gaudi. Starlark

typst. A markup-based typesetting system that is powerful and easy to learn.

mini-adapton. Typescript Implementation of mini-adapton (https://arxiv.org/pdf/1609.05337.pdf)

typos. Source code spell checker

D2_Calculation_API. Rust

git-absorb. git commit --fixup, but automatic

salsa. A generic framework for on-demand, incrementalized computation. Inspired by adapton, glimmer, and rustc's query system.

wezterm. A GPU-accelerated cross-platform terminal emulator and multiplexer written by @wez and implemented in Rust

little-loadshedder. A Rust hyper/tower service that implements load shedding with queuing & concurrency limiting based on latency.

tracing-indicatif. Tracing layer that automatically creates and manages progress bars for active spans.

buck2. Build system, successor to Buck

finch. The Finch CLI is an open source client for container development

rust-peg. Parsing Expression Grammar (PEG) parser generator for Rust

targo. Wraps cargo to move target directories to a central location [super experimental]

seaoflogs. Interactive visualizer for LSP traces and other logfiles

apple-platform-rs. Rust crates supporting Apple platform development

rules_rust. Rust rules for Bazel

rsocket-rust. RSocket Rust Implementation using Tokio

pilota. A thrift and protobuf implementation in pure rust with high performance and extensibility.

ra-multiplex. moved to https://codeberg.org/p2502/lspmux

rust-langdev. Language development libraries for Rust

cargo-semver-checks-action. A GitHub Action for running cargo-semver-checks

madsim. Magical Deterministic Simulator for distributed systems in Rust.

turmoil. Add hardship to your tests

cargo-public-api. List and diff the public API of Rust library crates between releases and commits. Detect breaking API changes and semver violations via CI or a CLI.

vscode-wasm. A WASI implementation that uses VS Code's extension host as the implementing API

cargo-llvm-cov. Cargo subcommand to easily use LLVM source-based code coverage (-C instrument-coverage).

tracing-filter. A replacement for tracing_subscriber EnvFilter

ts2asl. TypeScript to AWS ASL transpiler

dotvim. collection of personal vim files

GitUp. The Git interface you've been missing all your life has finally arrived.

xshell. Rust

flowistry. Flowistry is an IDE plugin for Rust that helps you focus on relevant code.

melody. Melody is a language that compiles to regular expressions and aims to be more readable and maintainable

swift-bridge. swift-bridge facilitates Rust and Swift interop.

tracing-forest. Rust

nextest. A next-generation test runner for Rust.

monostate. Type that deserializes only from one specific value

tracing-texray. Tracing layer to quickly inspect spans and events

websters-1913. Styling of Webster's 1913 Dictionary for macOS

swift-bindgen. Bridging the gap between Swift and Rust

stack-graphs. Rust implementation of stack graphs

brigadier. Fetch and install Boot Camp ESDs with ease.

PyOxidizer. A modern Python application packaging and distribution tool

git-branchless. High-velocity, monorepo-scale workflow for Git

eldiro. Learn to make your own programming language with Rust