Open Source @IFTTT - A collection of IFTTT OSS projects.
Opensource Builders - Find open-source alternatives to commercial apps
Code NASA - 253 NASA open source software projects
Stylepill - Get beautiful open source UI components weekly
Google Open Source - All of Googles open source projects under a single umbrella
Hasura - Hasura is an open platform to build scalable app backends, offering a built-in database, search, user-management and more.