TNT dropped off the bottom of the 29.42 and higher drivers (but is supported up to 28.32 and possibly kludgeable for the 29's)
The TNT2 is from the same sort of era as the ATI RAGE128-PRO - and would beat the RAGE128 (non-pro) that I've been running up to now.
The TNT2 is still being sold - in the crippled M64 version with half the memory performance.
For 30 quid, I bought a secondhand Geforce2MX from a friendly computer fair trader - and I'm VERY happy with it.
There are also some cheap-ish ATI Radeon's around (saw one for 35 quid) - I assume they're a really basic version like a VE (OEM whiteboxed).
The choice with a TNT2 (or even a GF2), is either to use the very latest drivers - probably best for latest programs - or dig around for an archived driver that might be faster for the older cards - I'm sure I read somewhere that the "Detonator 2" series is faster for TNT2 - driver version 5.xx are Det-2 - or it might have even been 2.xx that they referred to, and not Detonator 2 - it was in the write-up for one of the tweaker programs at guru3d.com
(Edit: went looking!)
http://guru3d.com/rivatuner/
(from the notes)
Extreme System / Direct3D / OpenGL / Color tweaking possibilities for all existing versions of Detonator drivers (including Detonator 2.xx, the fastest drivers for TNT/TNT2 chipsets):