Well there is

• Vulkan (graphics API, successor to OpenGL which is used by e.g. Minecraft, CS Go i believe)
• DXVK (compatibility layer for games created with the DirectX Framework by MS)
• Lutris (game launcher for stuff you bought outside of steam, e.g. GOG, Epic, Uplay, etc.)
• Steam and maybe Proton but idk.
• i don’t know what that Atom sign thingy is