Open Source

The agent engineering platform for Python and JavaScript. Build context-aware reasoning applications with composable chains, tools, retrieval, and memory — the most adopted LLM framework.

The leading data framework for LLM applications. Connect your data to large language models with document loaders, indexing, retrieval pipelines, and agent workflows.

Run large language models locally. Get up and running with Llama, Mistral, Gemma, Qwen, DeepSeek, and dozens more — one command to download and serve any open-weight model.

High-throughput, memory-efficient inference and serving engine for LLMs. PagedAttention, continuous batching, and tensor parallelism — the production standard for LLM deployment.

The model-definition framework for state-of-the-art machine learning. Thousands of pretrained models for text, vision, audio, and multimodal tasks — inference and training in Python, PyTorch, TensorFlow, and JAX.

Call 100+ LLM APIs using the OpenAI format. Unified Python SDK and proxy server with cost tracking, guardrails, load balancing, and logging across Bedrock, Azure, Anthropic, Vertex, and more.

Microsoft's AI orchestration SDK for .NET, Python, and Java. Integrate LLMs into enterprise apps with plugins, planners, and memory — the .NET-first alternative to LangChain.

Framework for orchestrating autonomous AI agents. Define roles, goals, and tools — then let agents collaborate on complex tasks with delegation, memory, and structured workflows.

Environment variable validation and type safety for Node.js applications. Define schemas, enforce required variables, and catch misconfigurations before they reach production.

A Tiptap-based rich text editor compatible with Contentful's rich text format. Drop-in replacement with full schema support.

A React component for comparing strings and arrays with precise word-level and item-level highlighting of differences.

A beautiful directory tree visualization CLI with file type icons. Dendro (δένδρο) means 'tree' in Greek.

Production-grade semantic text analysis with embeddings, similarity, and vector operations.

Zero-dependency collection of essential React hooks — useLocalStorage, useDebounce, useMediaQuery, useClickOutside, useInterval, and more.

Fluent guard clause library for .NET — null checks, range validation, string format guards, and predicate-based assertions with chainable syntax.

Lightweight Result and Option pattern for .NET with fluent Map, Bind, Match chaining and implicit conversions.

CQRS mediator for .NET — requests, notifications, and pipeline behaviors with zero external dependencies.

Convention-based object mapper for .NET with custom member resolvers and fluent configuration.

Comprehensive LINQ extensions — WhereIf, Batch, Pairwise, Scan, Interleave, Partition, Traverse, and more.

Collection extensions for .NET — GetOrAdd, RemoveWhere, AddRange, Shuffle, TryAdd, and dictionary helpers.

String extensions — truncation, case conversion, slug generation, masking, validation, and HTML stripping.

DateTime extensions — business days, start/end of week/month/quarter/year, relative time strings, and more.

Enum utilities — GetDescription, GetDisplayName, ToDictionary, Parse, GetFlags, Next/Previous cycling.

HttpClient extensions — typed JSON methods, retry with exponential backoff, bearer tokens, and correlation IDs.

Configuration helpers — required values, typed binding, DataAnnotations validation, environment variables, and connection string parsing.

Lightweight observability helpers for .NET — structured logging, metrics recording, activity tracing, and correlation ID propagation with zero external dependencies.

Zero-dependency test helpers for .NET — fluent object builders, fake HttpHandler, fake time provider, assertion extensions, and deterministic random data.

Fluent guard clause library for Python — null checks, range validation, string format guards, and predicate-based assertions with zero dependencies.

Lightweight Result type for Python — Ok/Err with map, bind, match, unwrap, and a @safe decorator. Python 3.10+ pattern matching support.

String utilities for Python — case conversion, slugify, truncation, masking, HTML stripping, and validation with zero dependencies.

Environment variable validation for Python — schema-based type coercion, fail-fast error collection, and .env file loading with zero dependencies.

DateTime business helpers for Python — business days, start/end of periods, relative time strings, fiscal quarters, and age calculation.

Unified resilience patterns for Python — retry, circuit breaker, rate limiter, timeout, bulkhead, and fallback. Sync + async, thread-safe, composable.

Test data builders for Python — auto-generate dataclass and Pydantic instances from type hints with Fixture.create() and a fluent Builder API.

httpx API client toolkit — pagination, retry, rate limiting, auth refresh, and middleware composition for Python HTTP clients.

Zero-dependency unified LLM client — call OpenAI, Anthropic, and Ollama with one interface. Uses only stdlib urllib for HTTP.

Zero-dependency schema validation for Python — define, parse, and validate data with chainable Zod-like rules. Strings, numbers, objects, arrays, unions, and optional.

A 9-mode interactive boids simulation built with Next.js and Canvas 2D. Classic flocking, live flight tracking, satellite orbits, crypto markets, GitHub activity, earthquakes, drone swarms, network topologies, and job market dynamics.

Use PostgreSQL as both a document database and event store for .NET applications. Combines the flexibility of document storage with full event sourcing — no separate infrastructure required.

Supercharged .NET server-side development — messaging, command execution, and HTTP endpoints with minimal ceremony. Built by the Marten team for high-performance backend systems.

Simple, fluent fake data generator for C#, F#, and VB.NET. Ported from the legendary faker.js — generate realistic names, addresses, companies, and domain-specific test data with deterministic seeds.

Snapshot testing tool that simplifies assertion of complex data models and documents. Serialize results to files, diff on failure, and approve changes — works with xUnit, NUnit, and MSTest.

Create beautiful console applications with rich text, tables, trees, progress bars, charts, and interactive prompts. The missing terminal UI library for .NET.

Automatic type-safe REST library for .NET. Define your API as an interface, and Refit generates the implementation — inspired by Square's Retrofit for Android.

Resilience and transient-fault-handling for .NET — Retry, Circuit Breaker, Timeout, Bulkhead Isolation, Rate Limiting, and Fallback in a fluent, thread-safe API. The industry standard for .NET resilience.

Generate diagrams and flowcharts from text in a markdown-like syntax. Sequence diagrams, class diagrams, state charts, Gantt charts, ER diagrams, and more — all rendered client-side from plain text.

TypeScript-first schema validation with static type inference. Define schemas once, get runtime validation and compile-time types. The standard for type-safe data parsing in the TypeScript ecosystem.

End-to-end typesafe APIs made easy. Build and consume fully typesafe APIs without schemas or code generation — just TypeScript inference from server to client.

Build production-ready TypeScript applications with structured concurrency, typed errors, dependency injection, retries, and observability baked in. A complete toolkit for resilient software.

Ultrafast web framework built on Web Standards. Runs on Cloudflare Workers, Deno, Bun, Vercel, AWS Lambda, and Node.js. Small, fast, and middleware-rich with first-class TypeScript support.

Extremely fast Python linter and code formatter written in Rust. Replaces flake8, isort, pyupgrade, and Black — 10-100x faster. Drop-in compatible with existing configurations.

Fast, cross-platform task runner and build tool written in Go. Define tasks in a simple YAML file — a modern, simpler alternative to Make with better cross-platform support and dependency management.

A command runner, not a build system. Save and run project-specific commands in a justfile — like Make but without the arcane syntax, tab requirements, and implicit rules. Written in Rust.

Magical shell history stored in SQLite with optional encrypted sync across machines. Full-text search, fuzzy finding, and per-directory context — replaces ctrl-r with something that actually works.

A smarter cd command that learns your habits. Tracks your most-used directories and lets you jump anywhere with partial matches — z foo lands you in /long/path/to/foo instantly. Written in Rust.

Minimal, blazing-fast, infinitely customizable prompt for any shell. Shows git status, language versions, cloud context, and more — works with Bash, Zsh, Fish, PowerShell, and Nushell. Written in Rust.

Monorepo with companion code for all CrashBytes tutorials. Covering DevOps, cloud architecture, AI/ML, and modern engineering practices.