Default [Q] Freegee... confused

Can somebody explain how freegee fits into the picture of 'freeing' the LG G2. Is it basicaly an alternative to adb for installing/pushing a custom recovery? How is it any different than Flashify? It seems some use a combination of the two... and recently, its use seems to be the only way of getting custom recoveries on recent OTAs. I just don't get it.