Insync is a third-party Google Drive desktop sync client (now with OneDrive support too). It's available for Windows, Mac and Linux, and it's not free to use (see its pricing page), but you can try it for free for 15 days. The stable version features support for multiple accounts, Team Drives support, file manager integration, feed of recent file changes, symlink support, and much more.
Insync 3 Linux client UI and tray icon |
While it's in beta, Insync 3 is free to use, but once the beta phase ends, syncing will stop unless you already have a license or you purchase one.