Through March 31st, IK Multimedia has the Soldano SLO-100 guitar amp head available for free to AmpliTube 5 users (includes users of the free AmpliTube 5 Custom Shop).
Description from IK:
The Soldano SLO-100 (Super Lead Overdrive) is a true icon of high-gain tube distortion tone. The design has remained constant for over 20 years, and it is a hallmark of quality and design. It is often regarded as the finest guitar amp in the world. With the SLO-100 you have separate preamp and master volume controls along with three bands of equalization and a presence control.
How to redeem:
Want to redeem your free Soldano SLO-100? It's easy - just download and install AmpliTube 5 Custom Shop, launch the Custom Shop and use the Restore My Purchases tool. The SLO-100, plus 39 other iconic amps and FX, is yours forever as soon as you update.
FWIW, I had to log completely out and back into custom shop after restoring purchases before the SLO-100 head showed up as 'unlocked'. Not sure if that will be necessary for everyone.
Normally about $35 as a standalone purchase. To my ear, it has a full tone with lots of options to tweak the sound. Enjoy.