Circuito.io - Instant code and wiring for your project
PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica
Quip - Quip is the modern productivity suite that simplifies your life and helps your team get work done faster.
PiPer - A DIY Minecraft computer to build gadgets
VoltSim - VoltSim is an interactive realtime circuit simulator. It has digital and analog components and even Integrated Circuits. It is the perfect companion to students, hobbyists, and engineers.
Helium - Helium lets you accept payments by credit card for anything you want to sell online.