games - I've considered writing a hex-based board wargame as a web app
document editor - my catwiki wiki software is this, I suppose
security focused software a la Keybase client - the last time I wrote security software was a zero-user-interface email encryption system. If I did something like that in future, any interface would be web based
I'd write a web app and expose it on 127.0.0.1:someport rather than electron (which is bloated). Going down IgorPartola's list:
Text editor - I'd probably make this terminal-based using curses. Then I could easily use it on a remote server I'm ssh'd into.
video, audio editor - I've no plans/desires to write anything like these
system widgets and settings - a web app is highly suitable for editing system settings
web browser - far too big a project for me!
terminal emulator - plenty of good ones around already. I mostly use KDE's konsole.
git GUI client - I've recently been adding some git functionality to my catwiki wiki software (a web app) https://github.com/cabalamat/catwiki
crypto coin wallet - web app
chat client - web app or terminal-based
games - I've considered writing a hex-based board wargame as a web app
document editor - my catwiki wiki software is this, I suppose
security focused software a la Keybase client - the last time I wrote security software was a zero-user-interface email encryption system. If I did something like that in future, any interface would be web based