Public sites like CGTrader and Sketchfab are easier to access, while alternatives like CGPersia offer free, community-driven content without needing to manage torrent ratios.
If you are testing unverified plugins or software patches, run them inside a Virtual Machine (VM) or on a secondary computer to protect your primary production rig from malware. Cgpeers Alternative
Sometimes the most reliable alternative is the massive, open web. Public sites like CGTrader and Sketchfab are easier