Zen Cart is a veteran open-source PHP shopping cart released in 2003, forked from osCommerce, lightweight and free to self-host. It supports 50+ language packs and 30+ payment modules for low-cost cross-border commerce.
Founded in 2001, X-Cart is a leading PHP open source ecommerce platform powering 30,000+ online stores. Self-hosted with full code control and built-in multi-vendor marketplace features, it suits businesses that value ownership and low long-term cost.
Spree Commerce is an open-source e-commerce platform built on Ruby on Rails, released in 2007 with 13,000+ GitHub stars. Its API-first headless architecture suits Ruby teams needing deep customization and decoupled frontends.
Medusa is an open source Node.js headless commerce platform founded in 2020 with 21K+ GitHub stars. Supporting both self-hosting and cloud hosting, it is an open source alternative to Shopify.
SupportPal is a UK self-hosted help desk and ticketing system, with its core product launched in 2012 (originally ArcticDesk, renamed in 2016), offering a 30-day free trial so businesses keep customer data on their own servers and meet data sovereignty requirements.
osTicket is one of the most widely used open-source ticketing systems, free under GPLv2 and self-hosted, with over 10 million downloads. Its lightweight architecture and mature SLA and knowledge base make it the go-to for budget-conscious teams.
FreeCamp is a 100% free, open source and self-hosted online customer service chat platform, providing live chat and basic ticketing via a website plugin. Ideal for budget-limited startups seeking private deployment.
Chatwoot is an open-source customer communication platform founded in 2017 in Mumbai, India; the MIT-licensed community edition is free to self-host, with a 6+ channel unified inbox and cloud plans from $15/agent/month as an open-source Intercom alternative.
Zulip is an open-source team chat platform created in 2012 and released under Apache 2.0 in 2015, maintained by Kandra Labs and headquartered in San Francisco, United States. Its unique Stream+Topic threaded model makes async communication efficient and orderly, with unlimited users and self-hosting on the free plan.
Wire is an end-to-end encrypted communication platform founded in Zurich, Switzerland in 2014, offering encrypted messaging, voice and video, with open-source core code and self-hosting support, adopted by German federal agencies.
Rocket.Chat is an open-source team communication platform initiated in 2015, offering free self-hosting, end-to-end encryption, and Matrix federation, officially serving 12M+ users and 100,000+ organizations - a Slack alternative for organizations that prioritize data sovereignty and compliance.
Matrix is an open, decentralized communication protocol initiated in 2014 by a UK team, with native end-to-end encryption and federated self-hosting. The specification now at v1.19 is widely adopted by governments, enterprises and open-source communities as a data-sovereign messaging infrastructure.
Jitsi is an open-source video conferencing project that began as SIP software in 2003 and is now maintained by 8x8, offering the free no-registration meet.jit.si service and fully self-hosted deployment, built on WebRTC with an end-to-end encryption option for privacy- and sovereignty-minded teams.
Element is an end-to-end encrypted messaging client built on the open Matrix protocol, headquartered in London, United Kingdom, with E2EE by default, decentralized federation, open source, and ISO/IEC 27001:2022 certification.
SilverStripe CMS is a New Zealand-maintained open-source PHP CMS publicly available since 2007. Its 2-layer architecture and $0 core licensing model fit teams that value code control and long-term maintainability.
Directus is an open-source headless CMS and backend-as-a-service platform founded in Los Angeles, US in 2014 that automatically wraps any SQL database into REST/GraphQL APIs, with 25k+ GitHub stars, ideal for data-driven projects.
Cockpit CMS is an open-source headless content management system released in 2015 under the MIT license, delivering JSON content through a REST API. It is lightweight, self-hostable and flexible for developer-driven, tech-stack-agnostic content backends.
Agnostic CMS is an open-source headless content management system created by Tom H. in 2020, built around GraphQL API with custom content modeling and multi-environment deployment, self-hostable at zero license cost.
Windmill is an open-source developer platform founded in Paris, France in 2021, built with Rust/TypeScript, that turns scripts into workflows, internal tools, and scheduled tasks, supporting both self-hosted and cloud SaaS modes.
Umami is an open-source lightweight web analytics tool created by Mike Cao in 2020, MIT-licensed, cookieless, and naturally GDPR compliant, with free one-command Docker self-hosting plus multi-site management, share links, and plugin support.
Splitbee is a modern web and product analytics tool founded in Germany in 2020, offering event tracking, funnels, retention, A/B testing, and heatmaps with an about 5KB script, a free tier of about 10,000 events per month, and a GPL open-source self-hostable core.
RudderStack is an open-source customer data platform (CDP) founded in 2019 in San Francisco, California, USA, providing a Segment-compatible data pipeline with warehouse-first architecture and 500+ downstream integrations, available as free self-hosting or cloud.
Piwik PRO is an enterprise privacy-compliant analytics suite founded in 2013 in Gdansk, Poland, combining Web Analytics, Tag Manager, and Consent Manager, with self-hosted, private-cloud, and public-cloud deployment and a free plan of 500,000 requests per month.
Nibspace is a privacy-friendly web analytics tool for personal webmasters and small teams, cookie-less and Docker-self-hostable, with near-real-time event reporting, positioned similarly to lightweight options such as Plausible and GoatCounter.