Sc2gears is a general StarCraft 2 utility for everyone who is interested in the game (either a player or just a game analyzer). Its main features are replay management and analysis for both individual replays and mass replays (multi-replay statistics). It provides easy but powerful and efficient replay management and basic statistics for starters, and advanced statistics and time development charts useful even for professional players. It is also a great asset to tournament and league organizers in quick analysis of tournament results.
The program is written in Java, so everyone can use it: Windows, MAC OS-X and Linux users (and others where you can install Java SE).
Download the newest version from this page. Extract the zip to anywhere you like. You're done!
You just need Java Runtime Environment 6.0 or newer (Java 6.0 Update 10 or newer is required for the Nimbus theme).
Nothing else is required, you don't even need StarCraft 2 to run this program.
You can install Java here: http://java.com/
Sc2gears is not a 3rd party program!
That being said, you can use it anywhere, with or without any other launchers or programs, and you can never be banned for using it.