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exo

Exo Labs · Distributed & parallel computing

Open-source software that pools several Apple Silicon Macs (and Linux hosts) into one local inference cluster, sharding large models across devices with MLX

Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026

Fail2Ban

Fail2Ban project · Security tools

Log-scanning intrusion-prevention daemon that temporarily bans IP addresses showing repeated authentication failures by updating firewall rules

GPL-2.0-or-laterOpen sourceFreeSelf-hostedNov 2, 2026

FastAPI

Sebastián Ramírez (tiangolo) and FastAPI contributors · API development & tooling

In-depth entry

Python web framework for building HTTP APIs from type-annotated functions, with automatic validation through Pydantic and generated OpenAPI documentation

MITOpen sourceFreeLocalSelf-hostedNov 2, 2026

Forgejo

Forgejo project (Codeberg e.V.) · Version control & code hosting

Community-governed self-hosted Git forge forked from Gitea, stewarded by Codeberg e.V., with pull requests, issues, packages and Forgejo Actions

GPL-3.0-or-laterOpen sourceFreeSelf-hostedNov 2, 2026

Git

Git project (Software Freedom Conservancy) · Version control & code hosting

In-depth entry

Distributed version control system that records snapshots of a project's history locally and synchronizes them with remotes such as GitHub, GitLab or a bare repository over SSH

GPL-2.0-onlyOpen sourceFreeLocalSelf-hostedNov 2, 2026

Gitea

Gitea Ltd. / Gitea community · Version control & code hosting

In-depth entry

Lightweight self-hosted Git forge written in Go with repositories, pull requests, issues, packages and GitHub-compatible Actions, deployable as a single binary

MITOpen sourceFreeSelf-hostedNov 2, 2026

GNU Parallel

GNU Project (Ole Tange) · Distributed & parallel computing

Shell tool that runs commands in parallel over input lines on one or several machines, as a drop-in alternative to xargs and shell loops

GPL-3.0-or-laterOpen sourceFreeLocalSelf-hostedNov 2, 2026

Go

Google (Chrome DevTools team) · Programming languages & runtimes

Statically typed, garbage-collected language from Google that compiles to single binaries and is widely used for servers, CLIs and infrastructure tooling

BSD-3-ClauseOpen sourceFreeLocalSelf-hostedNov 2, 2026

Great Expectations (GX Core)

Great Expectations project (open-source stewardship by Fivetran) · Data quality & validation

Python data-quality framework that declares Expectations about datasets, validates them against pandas, Spark or SQL sources and produces Data Docs

Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026

gretl

gretl developers (Allin Cottrell, Riccardo Lucchetti) · Econometrics & causal inference

Free, GPL-licensed cross-platform econometrics program with a GUI, the hansl scripting language and estimators for time series, panels and limited dependent variables

GPL-3.0-onlyFreeOpen sourceLocalNov 2, 2026

Homebrew

Homebrew maintainers · macOS system utilities

In-depth entry

Community-maintained package manager for macOS and Linux that installs command-line tools (formulae) and desktop apps (casks) from the terminal

BSD-2-ClauseOpen sourceFreeLocalNov 2, 2026

Hoppscotch

Hoppscotch · API development & tooling

Open-source API client that runs in the browser or as a desktop app, supports REST, GraphQL and realtime protocols, and can be self-hosted for teams

MITOpen sourceFreeLocalSelf-hostedNov 2, 2026

Jest

OpenJS Foundation · Testing & QA

JavaScript testing framework created at Meta with built-in assertions, mocking, snapshot testing and parallel test execution

MITOpen sourceFreeLocalNov 2, 2026

Julia

The Julia Project · Programming languages & runtimes

Dynamically typed, JIT-compiled language for numerical and scientific computing that aims to combine high-level syntax with compiled-code speed

MITOpen sourceFreeLocalSelf-hostedNov 2, 2026

Karabiner-Elements

pqrs.org (Takayama Fumihiko) · macOS system utilities

Free, public-domain keyboard customizer for macOS that remaps keys and defines complex modifications through JSON rules at the driver level

UnlicenseOpen sourceFreeLocalNov 2, 2026

Kubernetes

Cloud Native Computing Foundation · Containers & virtualization

In-depth entry

Open-source system for scheduling, scaling and operating containerized workloads across a cluster of machines

Apache-2.0Open sourceFreeSelf-hostedNov 2, 2026

Kùzu

Kùzu Inc. (company acquired; project archived) · NoSQL & key-value stores

In-depth entry

Embedded property-graph database with Cypher, vector and full-text search; MIT-licensed but archived in October 2025 after the company was acquired

MITOpen sourceFreeLocalDiscontinuedNov 2, 2026

Lean

Lean FRO · Mathematical & statistical computing

Open-source functional programming language and interactive theorem prover with dependent types, the Mathlib mathematics library and VS Code tooling, stewarded by the Lean FRO

Apache-2.0FreeOpen sourceLocalNov 2, 2026

Let's Encrypt

Internet Security Research Group (ISRG) · DNS & domains

In-depth entry

Nonprofit certificate authority that issues free, automatically renewable TLS certificates through the ACME protocol

MPL-2.0FreeNov 2, 2026

llama.cpp

ggml-org (Georgi Gerganov and contributors) · Local LLM inference & serving

In-depth entry

C/C++ inference engine for LLMs and vision-language models with GGUF quantized weights, Metal, CUDA, Vulkan and other backends, a CLI and an OpenAI-compatible server

MITOpen sourceFreeLocalSelf-hostedNov 2, 2026

marimo

marimo (acquisition by CoreWeave announced October 2025) · Notebooks & interactive computing

Reactive Python notebook stored as a plain .py file that re-runs dependent cells automatically and doubles as a script or web app

Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026

Mermaid

Mermaid project (Knut Sveidqvist and contributors) · Design & prototyping

JavaScript library that renders flowcharts, sequence, class, state, ER, Gantt and other diagrams from a Markdown-like text syntax

MITOpen sourceFreeLocalNov 2, 2026

MkDocs

MkDocs project (Tom Christie and contributors) · Documentation tooling

Python static site generator for project documentation that builds a navigable site from Markdown files and a single YAML configuration

BSD-2-ClauseOpen sourceFreeLocalNov 2, 2026

MLX LM

Apple Inc. · Apple Silicon ML & MLX

In-depth entry

Python package and CLI for running, serving, quantizing and fine-tuning large language models on Apple Silicon with MLX

MITOpen sourceFreeLocalNov 2, 2026

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