These are games that are either in early stages of development, or have not yet been ported (effectively) to Windows. The opinions and facts I issue in here are founded on preliminary impressions and guesswork and are not to be considered in any way trusthworthy. That said, here are some glimpses of games to come.
I don't remember much about Adventurer of the Realm, but because its home page still exists, there's always a chance development will continue. Unfortunately, I don't have a copy of it anymore, and the game's site doesn't offer it for download.
Crossfire has been around for a while, and is definitely not "vaporware", but I've never been able to get it to run on DOS or Windows (XP). Here's what I've been able to deduce from the web site and screen shots:
Dimensions was still in very early stages of development when I reviewed it. According to the developer's web page (which seems to have disappeared), development was continuing as of February 1999, but I don't know what happened after that.
It used to be available for download but Simon withdrew it, waiting for it to reach a more complete state.
As perhaps hinted by its name, there is [so far] nothing truly original about Dungeon, nothing that would make me want to play it instead of one of the other Roguelikes. The most unique aspect is the inventory management, which in my opinion, is even worse than Omega's; it's VERY hard to use and doesn't give me anything extra in return. Hopefully the author will employ his humor and smarts in giving the game some direction.
Legend of Saladir has potential. Though it's very heavily ADOM-influenced, it at least introduces several cool, "modern" features like practice-based skills, tactics, shops, weapon degradation, etc. Erno's head is in the right place; he's trying to create a deep game with new ideas and not just going through the motions of making a Roguelike clone as a programming exercise. I sincerely hope he's able to continue his efforts.
The previous release date [for version 0.30] was 1998-04-19, exactly a year before the current one [0.34]. Interesting, huh?
Anyway, I noticed much more of an ADOM influence in the current version, which is unfortunate because I dislike ADOM's keybindings and quest-orientation. The dungeon still has enough wide-open Angband flavor to remain interesting, however.