Freeware folder sync?

Hi, im looking for a good freeware to sync folders, like two and from a memory stick, similar to synctoy for windows.
Ive had chronosync in the past, very good but way too much for what i need it for

the majority of the best software is freeware so there must be something out there. apart from that can you sync folders with the apple sync, or is that just for phones?

thanks in advance