Qtnp is program for math\physics teachers and students. There 4 tools: Pen, Line, Jogged line, and Circle. The software can draw grids, coordinate planes, and graphics. It has flexible settings, presentation mode, support for all base formats, a GUI for blackboards/tablets, and a built-in powerful calculator.
Checking of IP addresses to see if they're on any (important) RBLs.
A seed project that combines Play Framework, AngularJS, Bootstrap, and MongoDB..