Allway Sync is a file and folder synchronization software for Windows.
It is FREE for personal use (with limitations), however, you should pay for a Pro license if you use this software for a commercial purpose or to process more than 40,000 files in a 30-day period.
It is together with GoodSync the only free high professional synchronisation tool, able to address WebDAV-Remote Memory, Windows Mobile SD-Cards, all Windows Mobile files, FTP Remote Memory or Amazon S3 online storage. No PC-to-PC sync about the web, as DropBox, Windows Live Sync, SpiderOak or SugarSync do. MTP is not supported. More Info »
Allway Sync uses innovative synchronization algorithms to synchronize your data between desktop PCs, laptops, USB drives and network drives.