Joplin
Description: Joplin is an open source note taking and to-do application with markdown support, organization tools and end-to-end encryption. It is available on Windows, macOS, Linux, iOS and Android.
Type: software
Pricing: Open Source
Travis CI
Description: Travis CI is a hosted continuous integration service used to build, test, and deploy software projects hosted at GitHub. It is free for open source projects.
Type: software
Pricing: Freemium