There has been a number of editions of the Flintloque rules.
1st Edition Rules
1) Flintloque Box Set
2) Deadloque Box Set (The undead expension rules).
3) Essential Flintloque (a 4 page lite version of the rules given out free in gaming magazines)
2nd Edition Rules
4) Deadloque (2nd Edition).
5) Essential Flintloque (Lite version of the rules, published in a free Alternitive Armies flyer with a cartoon strip).
6) Flintloque Reloaded (a box set or rule book).
7) Flintloque Lite (a free pdf of the core rules and the final version of the 2nd edition)
3rd Edition Rules
8) War in Catalucia
9) Flintloque Lite (a free pdf light version of the 3rd edition core rules)
10) Death in the Snow
11) Bier and Bones
12) Blood on the Sand (TBC)
There is a set of large scale wargames rules based on the same background called Slaughterloo, which their has been two editions.
Also there have been a number of Flintloque Magazines published to support the game.