Skip to main content
OpenSourceAlternatives

Find what can replace the software you use

Search once across OSI-approved open source, source-available projects, and proprietary products.

Browse the directory

Outline

Outline

Team knowledge base that stays fast as it grows

Stars34.2K
Commit21h ago
LicenseBUSL-1.1

Outline is a documentation workspace built around search and structure rather than infinite nesting. Collections, a strong editor, and genuinely fast full text search make it usable at the size where most wikis become write-only.

Alternative toNotion
Refine

RefineOpen

React framework for building internal tools, admin panels, and dashboards

Stars35.9K
Commitjust now
LicenseMIT

Refine is an MIT-licensed React framework for building internal tools, admin panels, dashboards, and B2B apps on top of existing APIs.

Zellij

ZellijOpen

A terminal workspace with batteries included

Stars35.7K
Commitjust now
LicenseMIT

Zellij is a free, MIT-licensed open-source terminal workspace with batteries included: tabs, stacked and floating panes, layouts, and sessions that persist and resurrect, designed so developers are productive out of the box without tmux-style configuration.

Alternative toWezTerm
Buzz

BuzzAIOpen

Self-hosted team workspace where humans and AI agents share rooms

Stars35.4K
Commitjust now
LicenseApache-2.0

Buzz is a self-hosted team workspace where people and AI agents share the same channels, built by Block on a Nostr relay event log.

Alternative toSlack
Langfuse

LangfuseAIOpen

Open-source LLM observability, evals, and prompt management

Stars35.3K
Commitjust now
LicenseMIT

Langfuse is an open-source platform for tracing, evaluating, and improving LLM applications and AI agents, with prompt management and experiments built in.

Alternative toArize Phoenix
Kitty

KittyOpen

Cross-platform, fast, feature-rich, GPU-based terminal emulator

Stars35.2K
Commitjust now
LicenseGPL-3.0

Kitty is a free, open source, GPU-based terminal emulator for Linux and macOS that combines fast rendering with tabs, windows, and multiple layouts in a single app.

Qdrant

QdrantAIOpen

Open-source vector database for AI search at any scale

Stars35K
Commitjust now
LicenseApache-2.0

Qdrant is an Apache-2.0 open-source vector database written in Rust that serves filtered similarity search over embedding collections for AI retrieval.

Alternative toChromaMilvus
ntfy

ntfyOpen

Self-hosted push notifications over simple HTTP PUT/POST

Stars34.8K
Commitjust now
LicenseApache-2.0

ntfy is a self-hosted push-notification service that sends alerts to phones and desktops with a simple HTTP PUT or POST to a topic, plus open-source Android, iOS, web, and CLI apps.

Alternative toNovu
Mattermost

MattermostOpen

Team messaging for organisations that cannot use hosted chat

Stars33.2K
Commit19h ago
LicenseAGPL-3.0

Mattermost is channel-based team chat designed for environments where the message history has to stay inside a boundary: defence, healthcare, and regulated finance are its natural constituency.

Alternative toSlack
Medusa

MedusaOpen

Commerce building blocks rather than a fixed storefront

Stars32.4K
Commit2d ago
LicenseMIT

Medusa is a set of commerce modules - cart, orders, pricing, inventory, fulfilment - exposed as APIs you compose, rather than a themed storefront you customise around the edges.

Alternative toShopify
Tabby

TabbyAIOpen

Self-hosted AI coding assistant and Copilot alternative

Stars33.9K
Commit2mo ago
LicenseApache-2.0

Tabby is a self-hosted AI coding assistant that runs its own code completion server on your infrastructure as an open-source alternative to GitHub Copilot.

Alternative toGitHub Copilot
Apache Kafka

Apache KafkaOpen

Distributed event streaming for data pipelines and analytics.

Stars33.9K
Commitjust now
LicenseApache-2.0

Apache Kafka is an open-source distributed event streaming platform. Producers append events to durable topics that consumers read independently.

Alternative toAutoMQ
Handy

HandyAIOpen

Free open-source offline dictation that types speech into any app

Stars33.5K
Commitjust now
LicenseMIT

Handy is a free, open-source dictation app that transcribes speech fully offline with local Whisper or Parakeet models and types it into any focused app.

Alternative toVoiceInkWispr Flow
Onyx

OnyxAIOpen

Open-source AI search and chat across company knowledge

Stars32.4K
Commitjust now
LicenseMIT

Onyx is a self-hosted AI platform that connects to 50+ work apps to provide permission-aware search and chat across company knowledge.

Alternative toLibreChat
SigNoz

SigNozOpen

Open-source observability with logs, metrics, and traces in one tool

Stars32.3K
Commitjust now
LicenseMIT

SigNoz is an OpenTelemetry-native observability platform that combines logs, metrics, and traces with APM, dashboards, and alerts in one tool.

Alternative toDatadog
Fincept Terminal

Fincept TerminalAIOpen

Open-source financial terminal for market analytics and research

Stars32.2K
Commitjust now
LicenseAGPL-3.0

Fincept Terminal is an open-source financial terminal for market analytics, investment research, and economic data, positioned as a lower-cost alternative to subscription terminals.

Dokku

DokkuOpen

Self-hosted PaaS that deploys apps with a git push

Stars32.2K
Commitjust now
LicenseMIT

Dokku is a self-hosted platform-as-a-service that turns your own Linux server into a Heroku-style deployment target driven by git push.

Alternative toCoolify
Directus

Directus

A content platform that wraps your existing SQL database

Stars30.8K
Commit1d ago
LicenseBUSL-1.1

Directus points at a SQL database you already have and generates an admin interface and an API over it, without imposing its own schema. Existing tables keep their names, types, and constraints.

Alternative toContentfulAirtable
ProjectDiscovery

ProjectDiscoveryOpen

Open-source vulnerability scanner with template-powered detection

Stars32K
Commitjust now
LicenseMIT

ProjectDiscovery is an open-source vulnerability scanner built on the Nuclei YAML template engine that finds exploitable issues across apps, APIs, networks, DNS, and cloud.

Alternative toOpengrep
InfluxDB

InfluxDBOpen

Open time-series database for metrics, events, and IoT telemetry

Stars31.8K
Commitjust now
LicenseApache-2.0

InfluxDB is an open time-series database for metrics, events, and IoT telemetry, queried with SQL and InfluxQL and run self-managed or as a managed cloud.

JumpServer

JumpServerOpen

Open-source bastion host for audited privileged access

Stars31.7K
Commitjust now
LicenseGPL-3.0

JumpServer is an open-source bastion host for controlled privileged sessions, with browser-based access, centralized credential vaulting, and replayable session audit.

Alternative toDefguard
Dragonfly

Dragonfly

In-memory data store and cache with Redis API compatibility

Stars31.7K
Commitjust now
LicenseBUSL-1.1

Dragonfly is an in-memory data store and cache with a Redis-compatible API, so existing Redis clients and applications connect without code changes.

Anki

Anki

Free flashcard app that schedules reviews with spaced repetition

Stars31.7K
Commitjust now
LicenseAGPL-3.0-or-later

Anki is a free flashcard program that schedules each card for review just before you are likely to forget it, cutting time spent on material you already know.

Alternative toQuizlet
Meetily

MeetilyAIOpen

Open-source local AI meeting notes for macOS and Windows

Stars31.6K
Commitjust now
LicenseMIT

Meetily is an MIT-licensed, open-source meeting assistant for macOS and Windows that transcribes on-device and drafts minutes, summaries, and action items privately.

Alternative toMinutes

People are looking for alternatives to

The proprietary products most often replaced by something in this directory.

All software people replace

Trending categories

Where the directory is growing fastest this month.

All categories