Keka started in SourceForge as an open source project. Since 1.0 is a closed code project (one of the reasons) and there're no plans to open the code again.
Don't get me wrong, I love Keka, and it will probably remain free forever, but the fact it is no longer open source is also true. The labels should reflect the latest info.
From the project README:
Don't get me wrong, I love Keka, and it will probably remain free forever, but the fact it is no longer open source is also true. The labels should reflect the latest info.