2 realistic assets you can get for free right now, with the date each giveaway ends, plus 6 at least 75% off and the always-free (CC0) sources. Checked every day.
Every free asset right now. Free by category: 2D sprites and art (14), 3D models (12), Anime style assets, Game audio and music (1), Character assets (9), Game dev courses (1), Environment assets (8), Fonts for games, Hand-painted assets (5), Low poly assets (7), Pixel art assets (9), Prop assets (6), Stylized assets (2), Game dev tools and plugins (5), Game UI assets (5), Vehicle assets, VFX assets (1), Voxel assets, Weapon assets (4).