205. Logging Log4j2Apache Log4j 2 is an upgrade to Log4j that provides significant improvements over its predecessor, Log4j 1.x, and provides many of the improvements available in Logback while fixing some inherent problems in Logback's architecture.
206. Incubator Nuttx AppsApache NuttX Apps is a collection of tools, shells, network utilities, libraries, interpreters and can be used with the NuttX RTOS
208. NanoNano is now part of Apache CouchDB. Repo moved to https://GitHub.com/apache/couchdb-nano
221. Kibble 1Apache Kibble - a tool to collect, aggregate and visualize data about any software project
235. ArrowApache Arrow is a multi-language toolbox for accelerated data interchange and in-memory processing
243. PulsarApache Pulsar - distributed pub-sub messaging system
246. SparkApache Spark - A unified analytics engine for large-scale data processing