Jagged Alliance is described as 'You and your mercenaries have to reclaim the island sector by sector, turn by turn. Cultivate the Fallow Trees and process their juices, as they are the basis for your funding. Hire better mercenaries, train local militias and manage your equipment wisely' and is a Turn Based game in the games category. There are more than 10 games similar to Jagged Alliance for a variety of platforms, including Windows, Steam, Linux, Mac and GOG.com apps. The best Jagged Alliance alternative is X-COM. It's not free, so if you're looking for a free alternative, you could try Fire Emblem or Merc Tactics. Other Jagged Alliance like games are Shadowrun Returns, Xenonauts, Silent Storm and Invisible, Inc..
Of all the JA remakes, this is the one seems more true to the original, although it's still in Beta.