Abima is a free German generic rules set. The rules are presented in a complex way, but can't hide that they are based on Das Schwarze Auge. Though the system wants to be generic, the rules are mainly usable for fantasy games (no firearms rules, no vehicles rules, etc.).
The main dice mechanic is to roll with a d20 over a target number. The attribute or skill involved in the roll is subtracted from the target number. The d20 "explodes", allowing a re-roll when a 20 is scored, adding the results. It also "implodes", forcing a re-roll of a 1 and subtracting the rolled result.
A character is composed of 12 attributes and various skills. A skill's base value is determined by one or more attributes. To this base value the skill level is added. Skill levels may be negative or positive.
Character creation may be randomized or point based. The player gets to raise attributes and skills and. He may also roll up a life path from birth to adulthood. Those options are mostly flavor, but may change attributes, skills or equipment if the GM allows it. There are no rules for non-human characters.
The combat system is mainly a series of attacks and parries with some special actions and rules (one takes the wind into account for ranged attacks). If a character is hit, the damage is subtracted from a life point pool. Armor reduces the amount of damage.
Abima has no rules for magic.