Last updated Apr 20, 2026

Find the best open source alternative

We curate open source tools that replace paid software. We manually review every listing for quality, active maintenance, and self-hosting support.

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icon of Keploy

Keploy

An AI-powered open-source testing tool that generates test cases and mocks for unit, integration, and API testing, increasing test coverage.

stars 17.1Klicense Apache-2.0lang Go
icon of Oso Cloud

Oso Cloud

Oso Cloud is an open source authorization library and service for adding RBAC, ABAC, and relationship-based access control to any application. A developer-first alternative to Permit.io; Apache-2.0 licensed.

stars 3.5Klicense Apache-2.0lang Rust
icon of Quiet

Quiet

It is a peer-to-peer, serverless messaging application prioritizing privacy and security through Tor integration and end-to-end encryption.

stars 2.6Klicense GPL-3.0lang C
icon of Manticore Search

Manticore Search

Manticore Search is an open source full-text search engine compatible with MySQL protocol, offering fast document search, faceted filtering, and real-time indexing. A self-hosted alternative to Elasticsearch; GPL-2.0 licensed.

stars 11.8Klicense GPL-3.0lang C++
icon of MuPDF

MuPDF

A fast and powerful library for managing PDF and other document formats, offering tools to extract, convert, render, and edit documents.

stars 2.7Klicense AGPL-3.0lang C
icon of Qdrant

Qdrant

Qdrant is a self-hosted vector database and similarity search engine written in Rust, optimized for AI applications and semantic search. Apache 2.0 licensed.

stars 30.5Klicense Apache-2.0lang Rust
icon of PDF4QT

PDF4QT

An open-source PDF editor for Windows/Linux, offering a C++ library, command-line tool, and applications for viewing/editing PDFs.

stars 1.3Klicense MITlang C++
icon of Keestash

Keestash

Keestash is an open source, self-hosted password manager for individuals and teams with a web interface for shared credential management and team access control. GPL-3.0 licensed.

stars 10license AGPL-3.0lang PHP
icon of Passwordcockpit

Passwordcockpit

A self-hosted, open-source password manager for teams, offering secure storage, sharing, and retrieval of credentials.

stars 135license BSD-3-Clauselang Dockerfile
icon of sK1 Project

sK1 Project

sK1 is an open source professional vector graphics editor for Linux focused on prepress and print production workflows, with CMYK color support and ICC profile management. LGPL-3.0 licensed.

stars 324license GPL-3.0lang Python
icon of RawTherapee

RawTherapee

RawTherapee is an open source RAW photo editor with non-destructive processing, advanced color science tools, and support for 800+ camera models. A self-hostable alternative to Adobe Lightroom; GPL-3.0 licensed.

stars 3.9Klicense GPL-3.0lang C++
icon of BLOOM

BLOOM

BLOOM is a 176-billion parameter open-access multilingual language model trained on 46 natural languages — the first model at GPT-3 scale with openly downloadable weights spanning non-English languages.

stars 1Klicense NOASSERTIONlang Shell

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