Sure thing boss.
-Invisible, Inc. (Corporate Espionage turn based action.) https://www.gog.com/game/invisible_inc
-Massive Chalice (Can get it in humble now, but regardless if you do or don't, grab it on a discount.) https://www.gog.com/game/massive_chalice (HumbleBundle Link: https://www.humblebundle.com/day-of-the-devs-2016 )
-Skulls of The Shogun (Fun little game, not grid based like X-Com, but is Turn Based.) https://www.gog.com/game/skulls_of_the_shogun
-Valkyria Chronicles (World War Turn Based fun. Not a huge fan of the story tho. Bit too cringe. But gameplay is solid.) http://store.steampowered.com/app/294860/
-Shadowrun: Returns/ Shadowrun: Dragonfall/ Shadowrun: Hong Kong (RPG focus, contains Turn Based combat. Cyberpunk goodness.) https://www.gog.com/game/shadowrun_returns
-Fire Emblem Series (POISON IN HIS MUTTON. Seriously tho, my favorite game series, exceptional turn based combat (technically is an SRPG, but I think it's the kind of stuff you'd be looking for. Also has 14 games in series, so it's bound to keep you busy!). Recommend starting with FE 7 on the GameBoy Advance. Recommend using emulator, but can be bought and played on WiiU store (or so I've heard...).) (Sorry, don't think I'm allowed to link ROMs. Quick Google search should show off some gameplay)
-Banner Saga (Never played myself, but heard good things.) https://www.gog.com/game/the_banner_saga
-Xenonauts (Literally a fan made old-school X-Com.) https://www.gog.com/game/xenonauts
-Fallout 1/2/Tactics (More emphasis on RPG. Tactics however has you controlling a custom squad in isometric real-time or turn based combat.) https://www.gog.com/game/fallout
-Advance Wars (Not very knowledgeable about this series (only played a bit of the first game), but I hear good things about it. One of the greatest SRPGs around.)
-Original X-Coms! :) https://www.gog.com/game/xcom_ufo_defense
If you want more let me know.