Spectrum - Browser-based app to visualize the frequencies of an audio file.
Berkanan - Chat with people nearby. Even offline, on an ✈️.
Treadie - Create your own micro-social network for topics
Jodel - What is Jodel all about? Jodel is the community that shows you what's happening in your area in real-time.
Qwasap - A Telegram bot that lets you talk to people who are located anywhere in the world.
Carrd - Simple, responsive one-page site creator.