Then there is this amateur clone of Diablo from early 2000s called Lost Legends. Also freeware but I have no idea where to download the latest version. Either way the authors blog still exists today.
https://ghostwoodgames.wordpress.com/lost-legends-downloads/
Screenshots:
Based on the archive name i found it
in this shady site. I say "shady" because it looks like searching for the filename in google ends with several similar pages in different URLs with different languages but exact same layout (
example). In any case, the downloaded files match the MD5 checksum of another page i found (still shady since it was just a redirect to some long gone file sharing service so the download doesn't work, but at least it had that MD5). I threw all DLLs, CABs and EXEs inside the ZIP file to virustotal which didn't find anything and finally i made an XP VM in VirtualBox just in case and it seemed to work ok (aside from a sound issue). So i tried it normally and it worked, meaning it was most likely legit.
So i uploaded it to archive.org here:
https://archive.org/details/llegends
As for the game, it is a bit barebones and clearly unfinished as you only have a single class, race, etc. Graphics are really rough, that skeleton above is among the highest quality and it sounds pretty much as it looks. But there is some gameplay there, you can bash stuff, use magic, there are special objects like fountains, monuments, etc that restore your health/mana or temporarily increase some ability (e.g. XP rate or one of your skills), there is both a skill tree and character attributes (strength, etc) that you can increase per level, a bunch of different items, weapons, armor with enchantments, etc, several monsters (many are visually reskins of each other), etc. You can also find... merchant wardrobes :-P from where you can buy and sell stuff (your inventory space is very limited).
Nowadays you can certainly find a bunch of better games but this one is indicative of the sort of freeware 3D games you could find during the mid2000s before Unity was ported to Windows.