Guys Audio Assault has a very nice Reverb for sale and it is a LinuxVST for just $5.
https://www.audio-assault.com/auralverb.php
The offer gives you an extra free plugin, for Linux they have:
Duality for Bass (Bass Amp)
https://www.audio-assault.com/duality.php
Get both for just $5 using the code XMAS. Offer ends soon.