Lucky Carrot - Make your employees super engaged, recognized, & appreciated
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
OldRobo - Fun gamification to increase employees' engagement at work
Materialize CSS - A modern responsive front-end framework based on Material Design
HeyTaco - Create stronger, happier teams that people love
Purecss - A set of small, responsive CSS modules that you can use in every web project.