[rombert]

Assuming that by Apache Oak you mean the Oak subproject of Apache Jackrabbit ( https://jackrabbit.apache.org/oak/ ), why would you consider it abandoned? Release 1.48.0 came out last week and it's been seeing steady activity throught the last years - https://github.com/apache/jackrabbit-oak/ .

I am a committer and PMC member in the project, so I may be biased.