Long Press by TOKI WOKI.

Write in the above field and hold key to access alternate characters.
Try ‘a’, ‘e’, ‘u’, ‘i’, ‘o’ or ‘$’ for example.

Pick letter by:

• using mouse wheel;
• hovering over it with your mouse;
• using arrow keys.

Release key to confirm choice.

Note

I wrote this plugin because I wanted to be able to insert rare characters as easily as on Android or iOS. I learned pretty quickly after doing it that Mountain Lion already offers such a feature. This is called reinventing the wheel...

Source

Available on GitHub.

Licence

The MIT License.