Final update related to this funding request. These are the Highlights:
Grin++ Desktop
- The UI for Grin++ Desktop stability was improved. We’re using another server for the availability checker and also important fixes were made on how this works internally.
- All the packages were updated to recent versions, fixing vulnerabilities and making the app feel faster.
- More translations were added for Grin++ and the support for Windows 7 was improved.
Grin++ Android
- A lot of bug fixing work was done, specially in Sending and Receiving transactions.
- A new screen was added where users can change basic settings.
- The embedded node is up to date with the master branch.
- Screens styles were improved and unified.
Next
Since we want and need more contributors, improving the codebase is now a priority. Bugs will be fixed, of course, but before adding more features we should make things easier for anyone willing to collaborate, this also includes documenting a lot on both sides: backend and frontend, decoupling the code, and more.
I will also want to see the possibility of generate multiple address for a wallet, and a standard API definition, both of these 2 things will require a RFC.
Thank you for the support! 
Edit: There is a RFC from September 30th, 2019 regarding the API, but I believe that it can be improved.