- Basic PDF support
- Form support
- Open source
- Packaged for Debian
- vi-style keybindings (jklh to move around, etc.)
- Minimal interface (hidden-by-default or non-existent statusbar/toolbar)
The application I am refering to is PDF-XChange Editor which works well with Wine on X11 (on Wayland it causes a system freeze up).
Of course I am interested in any other application that shows fancy tooltips, but I tried Qoppa, Foxit, Okular, Evince PDF viewer and also Master PDF Editor; none of them showed fancy tooltips.