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spark2014
SPARK 2014 is the new version of SPARK, a software development technology specifically designed for engineering high-reliability applications.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
gnatprove is open source. The whole SPARK is Open Source. :) The only difference between SPARK Pro and SPARK community is CodePeer tool included into SPARK Pro. Anything other (gnatprove, all 3 provers) are Open Source. Also, SPARK isn't owned by FSF, but by AdaCore.
NOTE:
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Hence, a higher number means a more popular project.