The 5.2.1 version of Guitar Rig for Mac is provided as a free download on our website. The program lies within Audio & Video Tools, more precisely Music Production. Guitar Rig for Mac is sometimes referred to as "Guitar Rig 3", "Guitar Rig 4", "Guitar Rig 2". The most popular versions among the program users are 5.1, 5.0 and 4.2. This Mac application is a product of Native Instruments. The bundle id for this app is com.native-instruments.Guitar Rig 5.
From the developer:
GUITAR RIG 4 PRO is the ultimate all-in-one guitar and bass solution for perfect custom tone.
You may want to check out more Mac applications, such as M-Audio Key Rig, Matt Warnock 101 Jazz Guitar Licks or Guitar Jam Tracks - Scale Trainer & Practice Buddy, which might be related to Guitar Rig.