Not the TT but feel free to discuss that if you like. I thought it would be worth having a specific thread for anything and everything Games Workshop-derived, which as of last year, is really quite a lot, and I'm under the impression that the games are getting quite good (not fully amazing, but definitely better than previous assware). Obviously the biggest "universe" to draw game material on, obviously Daz just wants XCom2 in the 40k universe and he's right, but in the meantime:
Dawn Of War 2 - http://store.steampowered.com/app/15620/ A much tighter focus on RTT with some RPG-lite elements. Some people didn't like this focus, I did, and thought it was cool for a sequel to try something a bit different.
Total Warhammer - http://store.steampowered.com/app/364360/ I've seen good things watching Cohh play it. A lot of negative reviews recently solely about aggressive DLC marketting, what-fucking-ever. Still got to play it.
Battlefleet Gothic - http://store.steampowered.com/app/363680/ Essentially a 2D RTT Battlefleet game with plenty of WH40K style. Quite repetitive with randomly generated missions, but also good fun and rather moreish.
Mordheim - http://store.steampowered.com/app/276810/ Just started this. Stylish, interesting gameplay, overwhelming amount of stats that you don't know if you need to heed or not. Meant to be frustrating and RNG-ridden, but also good if you persist with it.
Space Hulk Deathwing - http://store.steampowered.com/app/298900/ Buggy beta put me off getting this early, but from most accounts, apart from the bugs the style of it is great and the gameplay decent. Hopefully will get polished after release.
WH40k:Sanctus Reach - http://store.steampowered.com/app/502370/ A very very lite tile-based version of the TT game, with only Space Wolves vs Orks at the moment. Looks like it would be spot on as a �5 budget title.
Manowar Corsair - http://store.steampowered.com/app/344240/ Something a bit different, Warhammer pirating / trading / naval combat. Currently looks very previous-gen, but also meant to be a whole lot of fun. One to keep an eye on.
N.B. I haven't listed mobile / tablet games because they're the stuff that's given GW games a bad reputation for shallow, pointless, cash-grabbing shovelware in previous years. FWIW I do quite like Warhammer Quest as an Android game - it's very basic, but fun and well-presented.