Top ALTER GitHub Repositories & Tools (2026)

Free, open-source clipboard manager for macOS. Native card-style UI with Pinboards, Quick Look, and 100% local storage.

The local-first AI assisted research workspace for scientific writing & publishing. Research, Write, Compile, Verify and Publish in LaTeX • Typst • Markdown • Git-native • Open Source • Desktop Performance

Open Managed Agents — an open-source alternative to Claude Managed Agents and OpenAI Agents API. Deploy with Node.js or Docker, run on Cloudflare, or use hosted OpenMA. Choose your models, harnesses and sandboxes.

Free, open-source fan control for Apple Silicon Macs (M1, M2, M3, M4, M5). Menu bar app + CLI. Alternative to Macs Fan Control, TG Pro, AlDente.

Fast macOS disk-usage analyzer with an interactive sunburst chart — scans a full drive in seconds.

Self-hosted private chat: no cloud, no telemetry, no Big Tech. Discord alternative that runs on your own machine.

MIT-licensed, COM-free .NET libraries for creating, reading, editing, converting, rendering, and extracting Office, PDF, email, OneNote, and text formats.

AI-native open-source alternative to Vercel + Sentry + PostHog + Pingdom + Resend + E2B. 440+ CLI operations with drop-in skills for Claude Code, Codex & OpenCode — deployments, analytics, session replay, error tracking, OpenTelemetry, email, sandboxes & AI gateway in one self-hosted Rust binary.

Open-source universal artifact registry. Drop-in Artifactory/Nexus alternative with 40+ package formats, security scanning, WASM plugins, and edge replication.

FreeScout — Free self-hosted omnichannel AI-powered helpdesk & shared mailbox

Unrestricted Open-source alternative to AI video platforms — Free AI image & video generation studio with 600+ models (Flux, Midjourney, Kling, Sora, Veo). No content filters. Self-hosted, MIT licensed.

Eigent: The Open Source Cowork Desktop - Local and Free Alternative to Claude Cowork and Codex

Scalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably, socket.io, Phoenix.PubSub, SignalR. Set up once and forever.

A free coding agent in your terminal. It runs on the smartest free model that is up today.

JevK5: open-weight alternative to TypeSafe Jev. Typed decisions with probabilities in one forward pass; Apache-2.0 weights and code.

Free, open-source application firewall for macOS. Little Snitch alternative with zero telemetry. Native SwiftUI world map, rules manager, DNS over HTTPS, pf-based blocking. Signed, notarized, MIT licensed.

Open Source CRM for Startups and enterprises. Django + SvelteKit · Self-hosted · Multi-tenant · Free forever

Church Management Software

Self-hosted image hosting and sharing platform with private links, collections, S3/SMB storage, OIDC SSO and ShareX support.

Open-source, self-hosted enterprise & site search server built on OpenSearch. Crawls web / file / DB / cloud sources, 20+ languages, REST API, and AI/RAG & semantic search. Apache-2.0.