There are many vibrant projects under the Apache Foundation that aren't the web server or other handed off projects, Superset[1] and Solr[2] being the two I am familiar with.
There are plenty more. Log4j, Maven, Zookeeper aren't dead. Not sure about Mesos but I was given a book on it a few years back as part of... the SMACK stack I think?
1: https://superset.apache.org/
2: https://solr.apache.org/