Open-source startups tagged #hacktoberfest

Virtual whiteboard for sketching hand-drawn like diagrams

#1 PDF Application on GitHub that lets you edit PDFs on any device anywhere

:house_with_garden: Open source home automation that puts local control and privacy first.

The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.

🚀 Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable, and developer-first.

🔥 🔥 🔥 A Free & Self-hostable Airtable Alternative

Git with a cup of tea! Painless self-hosted all-in-one software development service, including Git hosting, code review, team collaboration, package registry and CI/CD

The open alternative to Salesforce, designed for AI.

The Free Software Media System - Server Backend & API

The Secure CommsOS™ for mission-critical operations

Developer-first error tracking and performance monitoring

Open source, composable payments platform | PCI compliant | SaaS and Self-host options | Enables connectivity to multiple payment, payout, fraud, vault and tokenization providers | Uplifts authorization with intelligent routing and revenue recovery | Reduce payment processing costs with cost observability | Reduces payment ops with reconciliation

A one-of-a-kind resume builder that keeps your privacy in mind. Completely secure, customizable, portable, open-source and free forever. Try it out today!

Platform to build admin panels, internal tools, and dashboards. Integrates with 25+ databases and any API.

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..

Making Docker and Kubernetes management easy.

Harness Open Source is an end-to-end developer platform with Source Control Management, CI/CD Pipelines, Hosted Developer Environments, and Artifact Registries.

☁️ Nextcloud server, a safe home for all your data

CockroachDB — the cloud native, distributed SQL database designed for high availability, effortless scale, and control over data placement.

Powerful yet simple to use screenshot software :desktop_computer: :camera_flash:

Event Driven Orchestration & Scheduling Platform for Mission Critical Applications

Scale computer-use 2.0 with open-source drivers, cross-OS fleets, and benchmarks for training, evaluation, and data generation.

Hey is a decentralized and permissionless social media app built with Lens Protocol 🌿

Make Your Company Data Driven. Connect to any data source, easily visualize, dashboard and share your data.

The #1 AI Harness for Building Resumes, PDFs, Cover Letters & more, locally with 100+ LLMs support.

⚙️ NGINX config generator on steroids 💉

Open Source eCommerce & Multi-Vendor Marketplace Platform Built with Laravel for Enterprise-Scale Commerce, Supporting 10M+ SKUs

🎮 Open-source, cross-platform 2D/3D/multiplayer game engine designed for everyone.

Focalboard is an open source, self-hosted alternative to Trello, Notion, and Asana.

Personal CRM. Remember everything about your friends, family and business relationships.

Invidious is an alternative front-end to YouTube

A modified web browser that helps in responsive web development. A web developer's must have dev-tool.

IDE-style autocomplete for your existing terminal & shell

Orchestrate Claude, Codex and Grok in one app. Open-source (MIT), reuses the subscriptions you already pay for.

Krayin CRM is Free & Open Source CRM Built with Laravel for Customer, Lead, and Sales Management.

For empowering community 🌱

Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready dashboards.

Empowering People Ethically 🚀 — Matomo is hiring! Join us → https://matomo.org/jobs Matomo is the leading open-source alternative to Google Analytics, giving you complete control and built-in privacy. Easily collect, visualise, and analyse data from websites & apps. Star us on GitHub ⭐️ – Pull Requests welcome!

A browser extension for automating your browser by connecting blocks

Linux shell for iOS

Private AI platform for agents, assistants and enterprise search. Built-in Agent Builder, Deep research, Document analysis, Multi-model support, and API connectivity for agents.

Build reliable customer-facing AI agents with Parlant: an interaction control harness optimized for controlled, consistent, and predictable LLM interactions.

Internet-scale OpenID Certified™ OpenID Connect and OAuth2.1 provider that integrates with your user management through headless APIs. Solve OIDC/OAuth2 user cases over night. Consume as a service on Ory Network or self-host. Trusted by OpenAI and many others for scale and security. Written in Go.

Music streaming solution that works.

The container platform tailored for Kubernetes multi-cloud, datacenter, and edge management ⎈ 🖥 ☁️

Concurrently chat with ChatGPT, Bing Chat, Bard, Alpaca, Vicuna, Claude, ChatGLM, MOSS, 讯飞星火, 文心一言 and more, discover the best answers

Amplication brings order to the chaos of large-scale software development by creating Golden Paths for developers - streamlined workflows that drive consistency, enable high-quality code practices, simplify onboarding, and accelerate standardized delivery across teams.

:mag: Quick file search & app launcher for Windows with community-made plugins

A Java 8+ Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)

🍃 Organic Maps is a free Android & iOS offline maps app for more than 6M travelers, tourists, hikers, and cyclists. It uses crowd-sourced OpenStreetMap data and is developed with love by the community. No ads, no tracking, no data collection, no crapware. Please donate to support the development!

🚀🎉📚 APITable, an API-oriented low-code platform for building collaborative apps and better than all other Airtable open-source alternatives.

AWX provides a web-based user interface, REST API, and task engine built on top of Ansible. It is one of the upstream projects for Red Hat Ansible Automation Platform.

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

Self-hosted Speed Test for HTML5 and more. Easy setup, examples, configurable, mobile friendly. Supports PHP, Node, Multiple servers, and more

Prowler is the world’s most widely used open-source cloud security platform that automates security and compliance across any cloud environment.

A fully open source & end-to-end encrypted note taking alternative to Evernote.

Movie organizer/manager for usenet and torrent users.

Stremio - Freedom to Stream

A habit tracker app which treats your goals like a Role Playing Game.

Skip YouTube video sponsors (browser extension)

Headless cloud-native authentication and identity management written in Go. Scales to a billion+ users. Replace Homegrown, Auth0, Okta, Firebase with better UX and DX. Passkeys, Social Sign In, OIDC, Magic Link, Multi-Factor Auth, SMS, SAML, TOTP, and more. Runs everywhere, runs best on Ory Network.

Open-source feature management platform

No clever tagline needed.

A privacy-aware, distributed, open source social network.

mailcow: dockerized - 🐮 + 🐋 = 💕

A glossy Matrix collaboration client for the web.

A blazing fast AI Gateway with integrated guardrails. Route to 1,600+ LLMs, 50+ AI Guardrails with 1 fast & friendly API.

An organizer for your porn, written in Go. Documentation: https://docs.stashapp.cc

wallabag is a self hostable application for saving web pages: Save and classify articles. Read them later. Freely.

Flexible level editor

Project has been discontinued ////// Mailchimp Open Commerce is an API-first, headless commerce platform built using Node.js, React, GraphQL. Deployed via Docker and Kubernetes.

Low-code platform allows you to build business apps, enables you to quickly create internal tools such as dashboard, crud app, admin panel, crm, cms, etc. Supports PostgreSQL, MySQL, Supabase, GraphQL, MongoDB, MSSQL, Rest API, Hugging Face, Redis, etc. Automate workflows with schedule or webhook. Open source Retool.

Open-Source Web UI for Apache Kafka Management

A commenting system powered by GitHub Discussions. :octocat: :speech_balloon: :gem:

Leantime is a goals focused project management system for non-project managers. Building with ADHD, Autism, and dyslexia in mind.

Continuous Profiling Platform. Debug performance issues down to a single line of code

A very simple static homepage for your server.

Take control over your live stream video by running it yourself. Streaming + chat out of the box.

OpenID Connect (OIDC) identity and OAuth 2.0 provider with pluggable connectors

A truly Open Source MongoDB alternative

Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. Don't be shy, join here: https://discord.com/invite/NAb6H3UTjK :)

JSON Hero is an open-source, beautiful JSON explorer for the web that lets you browse, search and navigate your JSON files at speed. 🚀. Built with 💜 by the Trigger.dev team.

OceanBase is the unified distributed database for the AI era — open-source, multi-model, one engine for your most demanding workloads.

A source-available invoice, quote, project and time-tracking app built with Laravel

TweetDeck for GitHub - Filter Issues, Activities & Notifications - Web, Mobile & Desktop with 99% code sharing between them