join.me is described as 'Easy to start, easy to join and with no downloads for viewers, connecting for external presentations, sales demos, and ad hoc get-togethers means you get work done and get on with it' and is a very popular Remote Desktop tool in the remote work & education category. There are more than 100 alternatives to join.me for a variety of platforms, including Windows, Web-based, Mac, iPhone and Android apps. The best join.me alternative is TeamViewer. It's not free, so if you're looking for a free alternative, you could try TeamViewer or RustDesk. Other great apps like join.me are Remmina, Chrome Remote Desktop, UltraVNC and Zoom.
CoScreen makes meetings more casual and is great for pair programming.