Font Pairer is a free online font combination generator within the Designs.ai suite. Using its AI engine, Font Pairer infinitely creates unique, downloadable font palettes based on your contrast preferences.
The fact that it's available in multiple languages makes this tool very useful for multilingual projects! I can't think of anything about fontsphere that i don't like at all (other than maybe having to download more data).
If you're interested in working with other people but not sure where to start or if they would be willing/able to work together then using one anothers' resources will make things easier by comparison alone since both are open source - no need to ask them permission firstβ¦
Pros
Easy interface
Extensive library
Great community support network, even outside your own language base