Table 2 Analyzed projects (transverse dimension: types of software) [9]

Distributed

Genie ^a

Federated job orchestration engine

2017-04–2018-01

2012

developed by Netflix

Pinot ^b

A realtime distributed OLAP datastore

2016-01–2017-12

7586

ShardingSphere ^c

An open-sourced distributed database middleware

2016-05–2018-02

2693

solution suite

Titan ^d

A database optimized for storing and querying

2012-06–2015-09

2698

large graphs

Zipkin ^e

A distributed tracing system

2017-06–2018-01

1577

Service-oriented

Cellbase ^f

NoSQL DB and Web Services to access

2016-09–2017-11

1193

biological data

GeoApi ^g

New York Senate Geopolitical Service API

2013-03–2018-03

1076

OHDSIWeb ^h

Services for the Observational Health

2016-09–2017-10

1450

Health Data Sciences and Informatics

OpenLegislation ⁱ

New York Senate Legislation Service API

2013-02–2018-04

2812

OpenMRS ^j

OpenMRS REST Web Services Module

2017-02–2017-10

2068

Mobile

IrcCloud ^k

A Chat on IRC for Android

2013-09–2018-05

528

OkHttp ^l

Android client for the OkHttp

2013-06–2018-02

965

network optimization suite

NextCloud ^m

Android version of the Next Cloud Application

2017-10–2018-01

1331

Retrofit ⁿ

Type-safe HTTP client for Android and Java

2013-09–2016-01

392

Signal ^o

A messaging app for simple private communication

2014-12–2018-04

2540

with friends