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Syncthing does not require any complex adjustments on your part. It provides you with an ID that you can share with others, in order to grant them access to your documents, whether they are on your local network or not. Syncthing is a powerful file-sharing utility that allows you to share documents with other devices without having to upload them to third-party servers. It comes with a smooth web-based GUI that features easy-to-understand features, thus proving itself to be both efficient and highly accessible.

Syncthing is still in development, although a large number of features have already been implemented:

Web GUI. Configure and monitor Syncthing via a responsive and powerful interface accessible via your browser.
Portable. Works on Mac OS X, Windows, Linux, FreeBSD, Solaris and OpenBSD. Run it on your desktop computers and synchronize them with your server for backup.
Simple. Syncthing doesn't need IP addresses or advanced configuration: it just works, over LAN and over the Internet. Every machine is identified by an ID. Just give your ID to your friends, share a folder and watch: UPnP will do if you don't want to port forward or you don't know how.
Powerful. Synchronize as many folders as you need with different people.