Pennywise - Cross-platform application to open any website or media in a floating window
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica
EasyEDA - EasyEDA - Web-based EDA suite; runs in browser.
PiPer - A DIY Minecraft computer to build gadgets
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...