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scikit-learn

scikit-learn developers · Mathematical & statistical computing

BSD-licensed Python machine-learning library for classification, regression, clustering, dimensionality reduction, preprocessing and model selection on NumPy and SciPy

BSD-3-ClauseFreeOpen sourceLocalNov 2, 2026

SciPy

SciPy developers (NumFOCUS) · Mathematical & statistical computing

Core open-source Python library for scientific computing on NumPy arrays: optimization, integration, interpolation, linear algebra, sparse matrices, statistics, signal processing

BSD-3-ClauseFreeOpen sourceLocalNov 2, 2026

Scrapy

Scrapy developers (maintained with Zyte) · Data collection & crawling

In-depth entry

Mature open-source Python framework for writing crawlers (spiders) that fetch pages asynchronously, extract structured items and export them through pipelines

BSD-3-ClauseOpen sourceFreeLocalSelf-hostedNov 2, 2026

Semgrep

Semgrep, Inc. · Security tools

Static analysis engine that matches code patterns written in the target language's own syntax, with an LGPL community edition and a commercial AppSec platform

LGPL-2.1-onlyOpen sourceFreemiumLocalNov 2, 2026

Sentence Transformers

Hugging Face · Embeddings, reranking & retrieval

Python library for computing and training embedding, cross-encoder reranker, sparse and multi-vector retrieval models, maintained by Hugging Face with thousands of pretrained models on the Hub

Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026

shadcn/ui

shadcn · Web frameworks & UI

Collection of accessible React components built on Radix primitives and Tailwind CSS that are copied into a project's source rather than installed as a dependency

MITOpen sourceFreeLocalNov 2, 2026

Slurm Workload Manager

SchedMD LLC · Distributed & parallel computing

Open-source cluster resource manager and job scheduler for Linux clusters, allocating nodes, launching jobs and managing queues on many HPC systems

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

SOPS

SOPS project (CNCF) · Secrets management

Command-line tool that encrypts the values of YAML, JSON, ENV and INI files with age, PGP or cloud KMS keys so secrets can be committed to git

MPL-2.0Open sourceFreeLocalNov 2, 2026

Sphinx

Sphinx team · Documentation tooling

Python documentation generator using reStructuredText or MyST Markdown with cross-referencing, API autodoc and output to HTML, PDF via LaTeX, ePub and man pages

BSD-2-ClauseOpen sourceFreeLocalNov 2, 2026

SQLite

SQLite Consortium / Hipp, Wyrick & Company · Relational databases

In-depth entry

Public-domain embedded SQL database engine that stores a whole database in one file and ships inside most operating systems and browsers

Open sourceOpen sourceFreeLocalNov 2, 2026

Starship

Starship contributors · Terminals & shells

Cross-shell command prompt written in Rust that shows Git status, language versions, cloud context and more from one TOML configuration

ISCOpen sourceFreeLocalNov 2, 2026

statsmodels

statsmodels developers (NumFOCUS) · Econometrics & causal inference

In-depth entry

Python library for estimating statistical and econometric models with R-style formulas, rich result summaries and tests: OLS, GLM, discrete choice, ARIMA, state space, VAR and more

BSD-3-ClauseFreeOpen sourceLocalNov 2, 2026

Supabase

Supabase Inc. · Relational databases

Open-source backend platform built around a dedicated PostgreSQL database with auto-generated APIs, authentication, file storage, realtime subscriptions and edge functions

Apache-2.0Open sourceFreemiumSelf-hostedNov 2, 2026

Swift

Apple Inc. · Swift & SwiftUI development

In-depth entry

Apple's compiled, memory-safe, multi-paradigm language for Apple platforms, Linux, Windows and embedded targets, developed in the open at swift.org

Apache-2.0Open sourceFreeLocalNov 2, 2026

SymPy

SymPy Development Team · Mathematical & statistical computing

Pure-Python computer algebra system for symbolic algebra, calculus, equation solving, matrices, physics modules, code generation and LaTeX output

BSD-3-ClauseFreeOpen sourceLocalNov 2, 2026

Tailwind CSS

Tailwind Labs · Web frameworks & UI

Utility-first CSS framework from Tailwind Labs that styles markup with composable class names and generates only the CSS a project uses

MITOpen sourceFreeLocalNov 2, 2026

TeX Live

TeX Users Group (TUG) · LaTeX & typesetting

In-depth entry

The comprehensive free TeX distribution for Linux, macOS and Windows, released yearly with the tlmgr package manager and all major engines, packages and fonts

Open sourceFreeOpen sourceLocalSelf-hostedNov 2, 2026

TeXstudio

TeXstudio contributors · LaTeX & typesetting

Open-source desktop LaTeX editor with integrated PDF viewer, autocompletion, wizards, spell checking and a structure view for Windows, macOS and Linux

GPL-3.0-onlyFreeOpen sourceLocalNov 2, 2026

tmux

tmux project (Nicholas Marriott) · Terminals & shells

Terminal multiplexer that keeps shell sessions alive on a server, splits a terminal into windows and panes, and lets sessions be detached and reattached

ISCOpen sourceFreeLocalSelf-hostedNov 2, 2026

Traefik Proxy

Traefik Labs · Reverse proxies & web servers

Cloud-native reverse proxy and ingress controller that discovers routes from Docker, Kubernetes and other providers and automates TLS through ACME

MITOpen sourceFreeSelf-hostedNov 2, 2026

Transformers

Hugging Face · Training & fine-tuning

Hugging Face's model-definition library for text, vision, audio, video and multimodal models, with Pipeline, Trainer and generate APIs used as the reference by training and inference engines

Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026

Trino

Trino Software Foundation · Analytical engines & OLAP

Distributed SQL query engine that federates queries across data lakes, warehouses and databases through connectors, formerly PrestoSQL

Apache-2.0Open sourceFreeSelf-hostedNov 2, 2026

Trivy

Aqua Security · Security tools

Open-source scanner that finds known vulnerabilities, misconfigurations, exposed secrets and license issues in container images, file systems, git repositories, IaC and Kubernetes clusters

Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026

Turborepo

Vercel · CI/CD & build automation

Build system for JavaScript and TypeScript monorepos from Vercel that runs package tasks in dependency order with local and remote caching

MITOpen sourceFreeLocalNov 2, 2026

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