- elastic/elasticsearch 17,172 Open Source, Distributed, RESTful Search Engine
- elastic/logstash 6,093 logstash - transport and process your logs, events, or other data
- fluent/fluentd 4,240 Fluentd data collector
- facebookarchive/scribe 3,290 Scribe is a server for aggregating log data streamed in real time from a large number of servers.
- miloyip/rapidjson 3,100 A fast JSON parser/generator for C++ with both SAX/DOM style API