Pennywise - Cross-platform application to open any website or media in a floating window
PlatformIO - Next-generation IDE for IoT
PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica
Circuito.io - Instant code and wiring for your project
Helium - Helium lets you accept payments by credit card for anything you want to sell online.
B4R - Development tool for native Arduino programs.