Hello fans of free rpg products,
Just last month I published a book of system-agnostic random mutation tables. It's called The Metamorphica, and you can read about it
If you want the free pdf version, you can go It is also available as a printed, perfect-bound book (160 pages, digest-sized) from lulu.com, for the cost of production and shipping.
You can use this book for post-apocalypse stuff, superheroes, mutant plants and animals, dark fantasy chaos gods, demons, aliens, mutant hordes, psychics, genetic crossbreeding experiments, all sorts of stuff. There's no rules like "+1 STR" or anything, but I figure it should be pretty easy to translate the descriptions into whatever game you like playing.
Hey, thanks for looking!