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If you're looking for something a bit different, Ironsworn is a popularly recommended system due to A) the Core is completely free, B) it's a complete, self-contained system with over 250 pages, and the actual rules being less than 50 pages, less than 25 if you ignore the character creation chapter, C) was designed for solo, but can easily support Co-Op (without a GM) and Guided (traditional, with a GM) play. It also has its own subreddit r/Ironsworn There is a paid expansion, Delve, which adds dungeon exploration to the mechanics. There's also a sister system, Ironsworn: Starforged, or just Starforged, is a futuristic sci-fi version. On top of those, the community is so collaborative and wholesome, that the Ironsworn SRD is in Creative Commons, and there are a TON of FREE HACKS for modifying the core system, such as adding high magic and more options to expand the core Oracles and Assets. Assets are what you use to customize your character; as there are no traditional classes, how you mix and match the assets determines your character's build. It is worth noting that Ironsworn is known as, and even calls itself, a Fiction-First game, not a Mechanics-first game, like D&D, Pathfinder, Savage Worlds, Fate, etc.