FloCtrl.app.zip is a zip file containing a Mac OS X application. For Macs, you should be able to simply download this, unzip it, and open the application. (Warning: do not rename FloCtrl.app) See https://sourceforge.net/p/floctrl/wiki/performers for instructions (coming soon).
FloCtrl-linux.zip is a zip file containing a linux application. For linux machines, download this, unzip, and run "java -jar ./floctrl_main/code/floctrl-linux.jar" from the terminal. See https://sourceforge.net/p/floctrl/wiki/performers for instructions (coming soon).
The other release file is "StressTest.jar". This program helps test network connectivity in preparation for running the "real" FloCtrl software. See https://sourceforge.net/p/floctrl/wiki/stress-test-release/ for instructions, or just run the program and it will tell you what to do. (Note: the instructions are in a modal dialog box, which you have to close to use the program.)