I currently use the Character Palette panel applet in Ubuntu 10.04 (old gnome) to insert scientific symbols and Greek letters into documents. I'm thinking about upgrading, possibly to Linux Mint with the Cinnamon desktop.

Current palette is: αβγδεζηθικλμνξοπρςστυφχψω∙⇌⇋Δ°

I click the character I want, and then paste it into any document using Ctrl + V. Super easy.

Is there any way to make this applet work in a different desktop environment?