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I am a big fan of the Vieja Escuela series of games available from https://grapasymapas.com/
Vieja Escuela is a standard D&D style fantasy game with Dwarves, Elves, Halflings, and Humans. There are also Cyberpunk, Kids on Bikes, Old West, Pulp, Science Fiction, and Urban Fantasy versions based on the same basic rules. The rulebooks are all very short, easy to learn, and free to download (or can be purchased for a low price from Lulu). Vieja Escuela has been translated into several languages, including English, and Vieja Escuela Pulp! has an English translation, but the rest of the books are currently only available in Spanish. The books are released under the Open Game License.