Add-on boards
Asus Xonar (except ROG and USB)
Auzentech (oh, and if you were struggling just to find official drivers, they are still available here)
- CMedia-based (Meridian series): UNi Xonar Drivers
- Creative-based (X-Fi series): PAX drivers or SB X-Fi Series Support Pack
CMedia (others)
Creative
See my post about daniel_k
You may also be interested in PAX drivers and in kX Project (the only Live! and Audigy driver with proper x64 and >2GB RAM support).
Check this if having any problem
HT Omega Claro
Onkyo Wavio SE-300PCIE
Razer Barracuda AC-1
Integrated chips
Now, things starts to be a bit messy here (and no, I'm not just talking about lower quality DACs). We may distinguish between two kind of custom drivers:
- Simply "unlocked" ones, that makes otherwise high-end-only features (like DDLive or DTS) available on all the products
- X-Fi modded. Like the last one, but you get the entire SB X-Fi MB suite too. Contrarily to popular beliefs, these actually reduce sound quality, though just ALchemy alone would be worth the effort.
Analog Devices (Conexant) SoundMAX
- Unlocked drivers: BlackHawk, DTS Connect/DTS Interactive
- X-Fi mod: -Alexa-
- something never materialized..
Gigabyte G1 motherboards
These use a real CA20K2 DSP, refer to Creative above
Realtek
Some of these drivers are claimed to address bugs in EAX accuracy
- Unlocked drivers: Original thread. Addendum Continuation. Alternative.
- X-Fi mod (in chronological order): first known reporting, 1Ketxxx's R2.16-R2.21, daniel_k's R2.21, 2Ketxxx's R2.21, Alexa & SoloR R2.48 (original thread was deleted), -Alexa- R2.60, Gamespirit R2.67-R2.71, Chromepad R2.74, latest?
VIA Technologies
- X-Fi mod: Gamespirit
Everything else not previously covered (like SigmaTel-->IDT-->Tempo Semiconductor) might find something here
USB headset
Microsoft LifeChat LX-3000
- C-Media modded drivers (CM108AH)