Name: MelonDS
Homepage: http://melonds.kuribo64.net
Why should this be included in the repository: Because MelonDS is a new Project that focuses on accuracy. I am aware that Desmume exists but the problem is that the author of Desmume sabotaged numerous pull requests that would have improved the emulator (Source: https://www.reddit.com/r/emulation/comments/4lnmw7/desmume_devs_intentionally_sabotaging_ds_wifi/). In short, MelonDS is superior to Desmume from a technical standpoint.
Is it Open Source: Yes
Who and how many users do you anticipate will use this software: Everyone who uses Desmume will eventually switch to MelonDS as it matures, and all those others who want to Emulate the Nintendo DS on Solus. How many? i do not know.
Link to source tarball/zip file: The website redirects to the Github page: https://github.com/StapleButter/melonDS
On a final note, MelonDS is already added to Arch repository