I have a commercial software product that will be launching soon.
It has a very similar name to a piece of open source software in a non-English speaking country. The only difference is a space.
Both products have similar goals but approach them in totally different ways, but could be seen to be in the same general market.
The open source software is not that popular from what I can see, but has been updated recently.
The name is not trademarked.
Change my product name (something I really don't want to do).
Approach the maintainers of the project and ask them if they mind me using a very similar product name.
Forget the other product exists and launch regardless.