Crazyflie Python client
Latest stable releases for Win/Mac OSX/Linux can be found here.
Crazyflie mobile clients
Crazyflie Nano Quadcopter (1.0) and Crazyflie 2.X firmware
Latest stable release can be found here.
Crazyradio and Crazyradio PA firmware
Latest stable releases can be found here (Note: Make sure to select the PA version for the Crazyradio PA)
Bitcraze Virtual Machine
See the VM download section on the wiki for the latest version. You will also find older versions there if you need them.