Freenet and IPFS are both content addressable retrieval systems, so they are similar in that way. However otherwise they are very different and there have been many other systems based on the idea of addressing things by hash. BitTorrent and DHT are two very notable systems of that type, and unlike freenet they are known for their speed. They are also known for people getting sued for piracy. I dont think the comparison between freenet and ipfs is very illuminating