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Adding transparency with GIMP

Open your image with GIMP and:

1. Layer -> Transparency -> Add Alpha Channel
2. Select either by colour or selected area:
    a. Select -> By Colour -> click on a colour (choose additional colours by holding down Shift and clicking again)
    b. Tools -> Selection tools -> (appropriate tool) (shift-click to add more regions/colors)
4. Edit -> Clear
5. File -> Save As … -> select GIF format
    -> export: select either Indexed or Greyscale -> save as GIF: check ‘Interlace’ option

and you get a great transparent image!

[source1, source2]