I'd also add Zim to the list
- works on many platforms - uses plain text (markdown like) storage formats but front end has a wysiwyg interface - auto saves - wiki like linking - very easy to use
If you want a slightly lighthearted variant, replace the line
echo "notify-send '$MESSAGE' 'Reminder' -u critical" | at $TIME 2>/dev/null
with
xcowsay ${MESSAGE} | at $TIME 2>/dev/null
Same overall effect, but with graphic which pops up at random point on screen.
I'd also add Zim to the list
- works on many platforms
- uses plain text (markdown like) storage formats but front end has a wysiwyg interface
- auto saves
- wiki like linking
- very easy to use