Summaries of these setups taken from the OPs (when possible) and edited for brevity:
M66: Paris Mafia by UmbrageOfSnow - a multiball game with a twist. Mimes are the second faction with a goal to get both players lynched. Town has investigative and killing roles to combat both factions.
M67: Shakespeare Mafia 2: Othello by ashersky - A 9 player game rated A for advanced in which two single player factions alternate night killing abilities. Town had lovers and an Innocent Child.
M69: GOP Mafia by faust - At the end of D1, after the lynch, there will be a special power distribution phase lasting 24 hours. Each town player must vote for one other player, and each town player may send in the name of a PR of the list below. If exactly one eligible player picked a PR, their role will change to this PR. If two or more eligible players picked he same PR, nobody will get it. Possible PRs included: Neighbor, Jailkeeper, Voyeur, and a Hidden One-Night Bomb. Mafia had a set of special powers to chose from.
RMM21: Yoshi's Island Mafia by scott_pilgrim - Unusual for RMM, this was an open setup. In this setup mafia wins when the Innocent Child was Night Killed or Lynched. Town had a series of protective and investigative roles including 6 1-shot Doctors.
RMM25: Buffy/Angel Mafia by faust - A complicated RMM game involving the following mechanics: Day actions, night actions, special actions, submissions, items, species, time travel and resurrection.