Table 3 Analyzed projects (transverse dimension: domains of software)

Graph

JanusGraph ^a

Highly scalable graph database

2017-04–2018-10

5657

Neo4J ^b

High performance graph store with all the

2018-09–2018-12

26497

features expected of a robust database

Titan ^c

Database optimized for storing and querying

2012-06–2015-09

3570

large graphs

Timeseries

OpenTSDB ^d

Distributed, scalable timeseries Database

2015-11–2018-12

1440

KairosDb ^e

Fast distributed scalable timeseries database written

2015-11–2018-11

1884

on top of Cassandra

Timely ^f

Timeseries database that provides secure access

2016-06–2017-08

827

to timeseries data