We'll do it for you! Please send your font files to email@example.com and specify which styles of the font(s) you'd like us to add.
For example, if you only use the bold style of your custom font, but your zip file contains the italic, light and narrow styles as well, please clarify that you only want us to add the bold style. This will expedite the process to get your font(s) added!
NOTE: ClearSlide supports custom fonts within PowerPoint only. We do not currently support custom fonts within Keynote.