NodeJS (stable (LTS) and beta (current) channel), Nginx, Apache, php, MySQL, rust, golang, Android Studio and oracle jdk, Qt Creator, Tilix, NetBeans, FileZilla
Darktable (updated), Gimp (stable and beta channel), DigiKam, Rawtherapee.
kde-connect, Firefox, VirtualBox
If there is a way to talk to Blackmagic Design to release their Fusion8 and DaVinci Resolve as snaps that would be the greatest thing ever.
Also having Steam as a snap would be so cool.