Fantasy Tactics is a set of miniature skirmish rules presented as an App. You can get it on the Google Play store.
Majestic 12 games offers these demo rules for their Ares fantasy skirmish miniature wargames system. They explain:
ARES: Miniatures Wargaming System is a complete skirmish-level fantasy game. But it is also much more. The flexibility of the system allows players to use any wargaming miniatures in their collection. Over two dozen sample figures are detailed in this book, but the real strength of ARES is its figure creation system, that encourages players to use their imaginations — which is the way it should be! Also included is a fully-customizable magic system, providing players with the opportunity to design their own spells for their troops.
Majestic 12 Games has these demo rules for their For the Masses Fantasy miniature wargames system. Here’s their blurb:
For The Masses is a complete fantasy mass-combat wargame system. But it is also much more: The flexibility of the system allows players to use any fantasy setting and armies to play out famous fantastical scenarios and ancient epic battles. Several sample army lists are included in the book but the real strength of For the Masses is the unit creation system. This system encourages players to be creative, use their imagination and have fun, which is the way wargaming should be.
From Chris Gilders comes No Quarter Fantasy Rules. These free wargames rules are a massive work, with 83 pages in the main rules book alone. There also are a large number of army lists, which is the real strength of the set. Like many fantasy games, figures are defined by a model profile, detailing combat stats, actions, strength, toughness and wounds. This is an amazingly comprehensive work for a free rules set, covering every aspect of fantasy warfare you could want.