CMake - CMake is an open-source, cross-platform family of tools designed to build, test and package software.
Followup.cc - FollowUp for email is a lightweight productivity suite that keeps your conversations and tasks from slipping through the cracks. Set perfectly timed reminders that arrive at the top of your inbox, right when you need them.
SCons - SCons is an Open Source software construction tool—that is, a next-generation build tool.
Kit CRM - A CRM for your Facebook page
Ninja Build - Ninja is a small build system with a focus on speed.
Streak - Manage customers inside Gmail