Sunsama
Sunsama is the calendar for modern teams. By connecting each block of time with the work that’s being done during that time, the calendar becomes the central hub for work. Currently, workers must constantly switch between different tools in order to figure out what’s going on each day and get their work done.
fruux
fruux is the company behind sabre/dav, the leading open source technology for contact, calendar, task and le synchronization based on open standards.