I've been using Rust Desk for a few months now and it's awesome. Works on Linux, Windows, Mac, iOS, and Android.
It's open source and super easy to setup and configure. For limited use cases, you can just use their freely provided servers, but you can also host your own server if you want.
I've been really impressed with the connection speeds and features, it has everything I need including end-to-end encryption for all network traffic, so your remote connection is at far less risk of getting snooped.