Alan Tidders’ free wargames rules for the English Civil War are his own modifications of the Jackson Gamers’ rules set.
A Splendid Victory is a set of free wargames rules for the English Civil War. They’re designed for 28mm figures, but the basing system is flexible.
David Marks has updated his For Parliament, King or Glory rules for the English Civil War. They’re a very professionally done set that I would love to play. I think I’ll have to get out my 6mm ECW figures.
For Parliament King or Glory is a set of free wargames rules available from the Yahoo Group of the same name.