These are some popular and user friendly OS integrations, providing things like system tray icons, file browser integration, etc. These are good starting points if you are a new user unfamiliar with Syncthing, or not prone to loving the command line.
There's a wealth of further integrations of all kinds listed on the community contributions page. Each integration has their own issue tracker for integration-specific issues, but discussion and assistance for all of them is welcome on the forum.
This is the basic Syncthing distribution, providing a command line / daemon like executable and a web based user interface.
If you are unsure what to download and you're running on a normal computer, please use the “64-bit (x86-64)” build for your operating system. If you're running on an oddball system such as a NAS, please consult your vendor.
Packages and installation instructions are available at apt.syncthing.net.