Found it! It’s https://tabletopy.com. Still in development, you can leave feedback on a recent reddit thread (https://reddit.com/r/InternetIsBeautiful/comments/qgrfvz/beautifully_designed_free_soundboard_to).
DMGR5 Creative Campaigning (1993)
Creative Campaigning has stats for Fionn MacCumhail as an 18th level Warrior/8th level Druid. It used a similar style of book cover and interior design to Celts and came out around the same time.
It can be the Tabletop Audio SoundPad:
a relatively small website with short audio clips and background sound effects designed for fantasy tabletop RPGs
It was created by dijon specifically for TTRPGs and contains short audio clips and background sounds.
The website was designed as a grid of icons, similar to the home page of a smartphone. The icons were ...