We wish to include other resources out there that can help you put together a list of participants in a workshop, for example. Entrofy is software that can help you select a list of candidates that meet a certain target mixture of attributes (e.g., career stage, subfield, etc.).
For more scholarship on how to prevent bias (geared towards gender, but applicable for all) see Ten Simple Rules to Achieve Conference Speaker Gender Balance. We're following Rule 6 here with Folks in GCB.
If you're an author of or are aware of a tool that can help out users of this list, please let us know at firstname.lastname@example.org. This is a work in progress.