1.questdb / questdbQuestDB is a high performance, open-source, time-series databasetime-serieslow-latencydatabasesqlquestdbtsdb+14 moreJavaAPACHE-2.017K total1.7K forks+94 starsfrom 17,399 · score 4.55
2.gchq / GafferArchivedA large-scale entity and relation database supporting aggregation of propertiesaccumulographgraph-databasehadoopbig-dataaggregation+3 moreJavaAPACHE-2.01.8K total363 forks+2 starsfrom 1,786 · score 1.10