I am always a sucker for games with level editors. Although I rarely ever make a level or a mission with one of these things that could barely extend beyond a "Hello, World!" functionality, it's still fun to play around with them. I also hate when they become "forgotten" because publicly-released level editors represent a lot of hard work for the developers to make them usable to the general public.
For anyone looking for both the level editor & patches for the retail CD of Darkstone (Which is something that I might have more then one of...
), look at the link below for all of your pre-GOG, pre-Steam, physical media needs.LINK
Patches & Level Editor for Darkstone - Thantos Realms, a website still offering patches & the level editor for Darkstone, a 1999 ARPG game.