I started using Apache Storm in 2012 and was really surprised at the number of Apache projects for stream processing back in 2015 or so when I did some research

I started using Apache Storm in 2012 and was really surprised at the number of Apache projects for stream processing back in 2015 or so when I did some research for moving off of storm. I remember Flink, Samza, Spark, Flume and NiFi(?) all being probably suitable options. I remember thinking exactly what you said! I guess there are enough users to keep the communities alive?