Is there a program to synchronize folders between a PC and a laptop (smartphone)?

Question

Data synchronization

Hello, such a need has arisen, you need to synchronize folders on devices, I know that now there are a lot of various "cloud storages". But I do not need to upload files to the cloud (more precisely, not necessarily), and most importantly, synchronize folders between a PC and a laptop or smartphone / tablet. That is, if you changed a file on one computer, it automatically changed on the other (respectively, when accessing the Internet). Now I use GoodSync, but somehow it's not very convenient and there is no way to synchronize mobile devices. Tell me what are the good options from paid software and free.
Thanks in advance.

Answer 1

Try Bit torrent sync