Discover Open Source Alternatives to Popular Software

A curated collection of the best open source alternatives to everyday SaaS products. Save money with reliable tools hand-picked for you.

OpenVPN

The community source tree for the OpenVPN tunneling daemon, aimed at administrators who build and run their own secure tunnels.

Alternative to:

Cloudflare One

Zero Trust VPN solutions for secure business networking

Stars
14,505
Forks
3,390
Last commit
6 days ago

Notesnook

End-to-end encrypted note taking across web, desktop and mobile, for people who want privacy without giving up a usable app.

Alternative to:

Notion

Zero-knowledge encrypted notes that sync across all devices

Stars
14,534
Forks
998
Last commit
7 days ago

MonoGame

A C# framework for building games across desktop, mobile and console, and the open reimplementation of Microsoft's discontinued XNA.

Alternative to:

Unity

Free, open-source framework for cross-platform game development

Stars
14,399
Forks
3,107
Last commit
6 days ago

Convex

A reactive database where server functions are plain TypeScript, for web developers who want live-updating apps without stitching a backend together.

Alternative to:

AWS Amplify

Build full-stack apps with TypeScript and real-time sync

Stars
12,499
Forks
811
Last commit
6 days ago

Automatisch

A workflow automation tool for connecting services like Twitter and Slack, self-hosted so business data never leaves your servers.

Alternative to:

Zapier

Open-source integration platform for seamless workflows

Stars
13,964
Forks
1,060
Last commit
7 months ago

CocoIndex

A Python framework that keeps indexes and embeddings continuously in sync with changing source data, for teams building retrieval pipelines.

Alternative to:

LlamaCloud

Ultra-fast data transformation for AI with lineage

Stars
11,496
Forks
898
Last commit
6 days ago

Portkey AI Gateway

An API gateway that routes requests to hundreds of model providers, with retries, fallbacks, caching and guardrails in front.

Alternative to:

Cloudflare AI Gateway

Complete production stack for AI teams

Stars
12,922
Forks
1,294
Last commit
4 months ago

Element

A Matrix client for the web and desktop, giving teams and individuals decentralized chat they are free to host themselves.

Alternative to:

Slack

Secure, decentralized messaging for teams and individuals

Stars
13,439
Forks
2,743
Last commit
4 days ago

Keep

An AIOps and alert management platform that deduplicates, correlates and automates alerts from every monitoring tool in one console.

Alternative to:

PagerDuty

Unify, automate, and elevate your monitoring workflow

Stars
12,290
Forks
1,496
Last commit
5 days ago

Fumadocs

A documentation framework for React frameworks and Astro that supplies content, navigation, search and API reference as composable pieces.

Alternative to:

GitBook

Build beautiful documentation sites with Next.js

Stars
13,082
Forks
728
Last commit
5 days ago

Scira

An agentic research platform that plans queries, searches live sources and returns cited answers, for anyone who researches on the web.

Alternative to:

ChatGPT

Minimalistic AI-powered search engine for instant answers

Stars
11,859
Forks
1,493
Last commit
30 days ago

Cachet

An open source status page system you host yourself, for teams that publish incidents and service health from infrastructure they control.

Alternative to:

Better Stack

Professional status page system for transparent downtime communication

Stars
15,235
Forks
1,630
Last commit
12 days ago

Lemmy

A federated link aggregator and forum written in Rust, for communities that want a self-hosted alternative to Reddit.

Alternative to:

Digg

Build your own federated discussion community

Stars
14,582
Forks
967
Last commit
25 days ago

Waterfox

A customisable Firefox based browser with data collection disabled, built in ad blocking and private DNS for privacy minded users.

Alternative to:

Google Chrome

Firefox fork with telemetry off and ad blocking built in

Stars
6,261
Forks
429
Last commit
4 days ago

CRM

An agent-first CRM where a background agent researches contacts and writes the records itself, for sales teams tired of manual data entry.

Alternative to:

HubSpot

An agentic CRM that keeps records current automatically

Stars
9,930
Forks
1,303
Last commit
9 days ago

AutoMQ

A stateless Kafka alternative that keeps data on S3, aimed at teams paying too much to run Kafka in the cloud.

Alternative to:

Confluent Cloud

S3-based serverless Kafka reinvented for cost efficiency

Stars
10,636
Forks
767
Last commit
5 days ago

Inbox Zero

An AI email assistant that organizes your inbox, pre-drafts replies and unsubscribes in bulk, for anyone losing hours to email.

Alternative to:

Superhuman

AI email assistant that automates, organizes, and declutters

Stars
12,158
Forks
1,517
Last commit
5 days ago

Fluxer

A free and open source instant messaging and VoIP chat app for friends, groups and communities, with a fully self-hostable backend.

Alternative to:

Discord

Open source messaging with privacy and community focus

Stars
10,213
Forks
743
Last commit
5 days ago

Gumroad

The source of Gumroad's web application, a Rails e-commerce platform where creators sell digital products directly to buyers.

Alternative to:

Shopify

Your all-in-one marketplace for digital creators and products

Stars
9,665
Forks
2,032
Last commit
5 days ago

Seafile

A self-hosted file sync and share platform with encrypted libraries and metadata views, for teams that want their own cloud drive.

Alternative to:

Dropbox

Self-hosted file sync with AI-powered organization

Stars
15,217
Forks
1,679
Last commit
15 days ago

LanguageTool

An open source proofreading engine for more than 25 languages, for writers and developers who want checking on a server they control.

Alternative to:

Grammarly

AI-powered grammar checker for 30+ languages

Stars
14,986
Forks
1,574
Last commit
5 days ago

Blinko

A self-hosted note app for capturing fleeting thoughts fast, with natural language retrieval over everything you have written.

Alternative to:

Notion

AI-Powered Note Taking App

Stars
10,992
Forks
779
Last commit
16 days ago

Filestash

A web file manager speaking FTP, SFTP, S3, SMB, WebDAV and around twenty more protocols, for anyone with storage scattered across systems.

Alternative to:

Dropbox

Unified file management for your enterprise storage

Stars
14,608
Forks
1,004
Last commit
5 days ago

Ory

An API-first identity server handling login, registration, recovery and profile flows, so your services stop reimplementing them.

Alternative to:

Auth0

A certified and battle-tested identity solution

Stars
13,869
Forks
1,181
Last commit
1 month ago

Typebot

A visual chatbot builder with more than 34 blocks, embeddable anywhere, for teams collecting answers in real time.

Alternative to:

Voiceflow

Create powerful chatbots without coding

Stars
10,314
Forks
3,203
Last commit
4 days ago

Shotcut

A free cross-platform video editor built on the MLT framework, for anyone cutting video on Windows, macOS or Linux.

Alternative to:

Adobe Premiere Pro

A free, open source, cross-platform video editor

Stars
15,096
Forks
1,488
Last commit
5 days ago

Checkmate

A self-hosted uptime and infrastructure monitor with status pages and incident alerts, for teams watching servers they run themselves.

Alternative to:

UptimeRobot

Beautiful open-source monitoring for modern infrastructure

Stars
10,795
Forks
1,196
Last commit
5 days ago

Sink

A link shortener with analytics running entirely on Cloudflare, for individuals and small teams who want to host their own.

Alternative to:

Bitly

Simple, speedy, and secure link shortener with analytics

Stars
7,093
Forks
5,178
Last commit
22 days ago

TinaCMS

A Git-backed headless CMS with a GraphQL API and optional live preview, for developers whose content lives in Markdown.

Alternative to:

Contentful

Visual editing for your Git-based content

Stars
13,780
Forks
748
Last commit
5 days ago

Arize Phoenix

An open source AI observability platform for engineers who need to trace, evaluate, and debug LLM applications.

Alternative to:

LangSmith

Open-source LLM tracing & evaluation for AI optimization

Stars
11,362
Forks
1,109
Last commit
4 days ago

Zotero

A free reference manager that collects sources while you browse, organizes and annotates them, and generates citations in over 9,000 styles.

Alternative to:

EndNote

Collect, organize, cite, and share research in one place

Stars
15,178
Forks
1,109
Last commit
7 days ago

OpenReplay

Self-hosted session replay suite that shows developers what users did on a web app and what broke underneath.

Alternative to:

Hotjar

Self-hosted session replay with complete data control

Stars
12,753
Forks
832
Last commit
7 days ago

Planka

A self-hosted kanban board with real-time syncing, for teams that want project tracking without handing work to a SaaS vendor.

Alternative to:

Trello

Self-hosted Kanban board with real-time collaboration

Stars
12,514
Forks
1,381
Last commit
9 days ago

Sure.am

A community-maintained personal finance and wealth management app you self-host, continuing the codebase abandoned by Maybe Finance.

Alternative to:

Monarch Money

The personal finance app for everyone

Stars
9,754
Forks
446
Last commit
4 days ago

Unleash

A feature flag service for teams that want to ship code to production in small releases and control rollout.

Alternative to:

LaunchDarkly

Feature flags for rapid, risk-free software deployment

Stars
13,787
Forks
892
Last commit
5 days ago

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Discover Open Source Alternatives to Popular Software

A curated collection of the best open source alternatives to everyday SaaS products. Save money with reliable tools hand-picked for you.

OpenVPN

Notesnook

MonoGame

Convex

Automatisch

CocoIndex

Portkey AI Gateway

Element

Keep

Fumadocs

Scira

Cachet

Lemmy

Waterfox

CRM

AutoMQ

Inbox Zero

Fluxer

Gumroad

Seafile

LanguageTool

Blinko

Filestash

Ory

Typebot

Shotcut

Checkmate

Sink

TinaCMS

Arize Phoenix

Zotero

OpenReplay

Planka

Sure.am

Unleash

Discover Open Source alternatives to:

Airtable

Fathom Analytics

Kissmetrics

Notion

Teamwork

Todoist

Discover Open Source alternatives to:

OpenVPN

Notesnook

MonoGame

Convex

Automatisch

CocoIndex

Portkey AI Gateway

Element

Keep

Fumadocs

Scira

Cachet

Lemmy

Waterfox

CRM

AutoMQ

Inbox Zero

Fluxer

Gumroad

Seafile

LanguageTool

Blinko

Filestash

Ory

Typebot

Shotcut

Checkmate

Sink

TinaCMS

Arize Phoenix

Zotero

OpenReplay

Planka

Sure.am

Unleash