Enhanced AppImage compared to the upstream one, made using sharun and its wrapper quick-sharun, which makes it easy and reliable to turn any binary into a portable package without using containers or similar tricks.

This AppImage bundles everything and it should work on any Linux distro, including old and musl-based ones.

This AppImage doesn't require FUSE to run at all, thanks to the uruntime.

This AppImage is also supplied with the seamless self-updater by default, so any updates to this application won't be missed.
Self-updater doesn't run if AppImage managers like am or soar exist, which manage AppImage integration and updates.
There is also a prompt and config for opting-out of self-updates if desired.

Screenshot of Tutanota Desktop AppImage-Enhanced working on Ubuntu 14.04 LTS VM

Filesize efficiency compared to flatpak

More at: AnyLinux-AppImages