Logseq is an open-source local-first note-taking app launched in 2021 by a US team, built around outlining and bidirectional links; notes are stored as Markdown files locally with PDF annotation and whiteboard support, a popular choice for building personal knowledge bases.
Froxlor is an open-source hosting control panel released in 2009 under LGPL, lightweight enough to run on a 256MB VPS, supporting Nginx/Apache, per-domain PHP management, and automatic Let's Encrypt SSL as a free server management option.
Cockpit is a Red Hat-sponsored open-source web server management console (LGPL v2.1+) supporting Fedora, RHEL, Debian and Ubuntu, offering free management of system services, storage, networking, VMs and containers.
WooCommerce is the world's most widely used open-source e-commerce plugin, built on WordPress with over 5M active sites, known for zero platform fees and a massive extension ecosystem.
Travis CI is a hosted CI service founded in Berlin in 2011 and one of the first to deeply integrate with GitHub, automating build and test via a single .travis.yml file, free for open source.
Signal is operated by the non-profit Signal Foundation using Signal Protocol end-to-end encryption, backed by $50 million in funding, free forever with no ads, and is the security benchmark recommended by privacy experts worldwide.
Mattermost is an open-source team collaboration platform founded in 2014 in Palo Alto, California, supporting private deployment with unlimited users. Adopted by NATO and the US Department of Defense, its free edition includes 10GB file storage for data-security and compliance scenarios.
Umbraco is an open-source .NET CMS founded in Denmark in 2005 with over 700,000 installations, known for its MIT-licensed core, friendly editing experience and Heartcore headless mode for Microsoft-stack enterprise content sites.
Activepieces is an open-source no-code automation platform launched in 2021, MIT-licensed and self-hostable, offering 200+ integration nodes and AI workflows as a lightweight Zapier alternative.
Stability AI is an open-source AI image generation company founded in London in 2020, known for Stable Diffusion models. It supports text-to-image, image-to-image, video and audio generation via cloud API and self-hosted deployment.
Mailbox.org, founded in 2014, is Heinlein Support's green encrypted email service based in Berlin, Germany. Powered by OpenXchange, it offers encrypted business email, cloud storage, and online office suite starting at €1/month.
OpenCart is a lightweight open-source e-commerce system developed by a UK-based team, known for being completely free, easy to install, and requiring minimal server resources.
Webiny is an open-source CMS built on an AWS serverless architecture, combining a Headless CMS, Page Builder, and GraphQL API. It shines at on-demand scaling and zero server operations for teams already on cloud infrastructure.
Gandi.net was founded in 1999 in Paris, France. Known for its "No Bullshit" philosophy — transparent pricing, no hidden fees. B Corp certified, privacy advocate. Supports 800+ TLDs.
Founded in 2003 in Philadelphia, Linode is one of the oldest cloud server providers. Acquired by Akamai in 2022, now part of Akamai Connected Cloud. Known for $5/mo starting price, clean UI, and excellent developer docs.
ZPanel is a UK-origin open-source virtual hosting control panel that once delivered integrated hosting management on Windows and Linux, but the project is now discontinued and suitable only for study and legacy environments.