Free, open source software for COVID contact tracing

List of tools for COVID contact tracing tools which are in whole, or in part, distributed as free, open source software.

AarogyaSetu (India)
Apturi COVID (Latvia)
ASI (Ecuador)
CoronaMelder (Netherlands)
CoronaWarnApp (Germany)
COVID Alert (Canada)
COVID Tracker Ireland (Ireland)
DP-3T (Switzerland)
eRouška (Czech Republic)
Hamagen (Israel)
HOIA (Estonia)
Inmuni App (Italy)
Koronavilkku (Finland)
NHS COVID-19 App (UK)
OpenTrace (Singapore)
ProteGo Safe
Radar COVID (Spain)
Rakning C-19 (Iceland)
StayAway COVID (Portugal)
Stop Covid (France)
Stopp Corona App (Austria)

Twitter thread with some details about the development history of these tools.

AarogyaSetu

Officially recommended in India (notice: maybe this code does not correspond to the apps being distributed).

Web site.
Android app.
License: Apache-2.0.
Development data in Cauldron.io.
Development repositories:
- nic-delhi/AarogyaSetu_Android GitHub repostory

Apturi COVID

Officially recommended in Latvia.

Web site.
Android and iOS app.
License: CC-by-sa 4.0 International
Development data in Cauldron.io.
Development repositories:
- ApturiCOVID GitHub organization.

Asi

Officially recommended in Ecuador.

Web site.
Android and iOS app, and server.
License: MPL-2.0.
Development repositories:
- ASI Ecuador Repositorio Nacional de Software Público GitLab organization.

CoronaMelder

Officially recommended in Netherlands.

Web site.
Android and iOS app, and server.
License: EUPL/1.2 and other.
Development data in Cauldron.io.
Development repositories:
- minvws GitHub organization

CoronaWarnApp

Officially recommended in Germany.

Web site.
Android and iOS app, and server.
License: Apache-2.0.
Development data in Cauldron.io.
Development repositories:
- corona-warn-app GitHub organization

COVID Alert

Officially recommended in Canada.

Web site.
Article in Wikipedia.
Android and iOS apps, and server.
License: Apache-2.0.
Development data in Cauldron.io.
Development repositories:
- cds-snc/covid-alert-app GitHub repository
- cds-snc/covid-alert-server GitHub repository
- cds-snc/covid-alert-server-staging-terraform GitHub repository
- cds-snc/covid-alert-server-demo-terraform GitHub repository
- cds-snc/covid-alert-portal GitHub repository
- cds-snc/covid-alert-documentation GitHub repository
- cds-snc/covid-alert GitHub repository

COVID Tracker Ireland

Officially recommended in Ireland.

Web site.
Android and iOS apps, and server.
License: MIT.
Development data in Cauldron.io.
Development repositories:
- HSEIreland GitHub organization
DP-3T (Switzerland)

DP-3T

Officially recommended in Switzerland, and origin and inspiration for many others.

Web site.
Android and iOS apps, and server.
License: MPL-2.0.
Development data in Cauldron.io.
Development repositories:
- DP-3T GitHub organization

eRouška

Officially recommended in Czech Republic.

Web site.
Android and iOS app, and server.
License: MIT.
Development data in Cauldron.io.
Development repositories:
- erouska-webapp GitHub repository
- erouska-android GitHub repository
- erouska-ios GitHub repository
- erouska-firebase GitHub repository
- erouska-homepage GitHub repository

Hamagen

Officially recommended in Israel.

Web site.
Android and iOS app.
License: MIT.
Development data in Cauldron.io.
Development repositories:
- MohGovIL/hamagen-react-native GitHub repository.

Hoia

Officially recommended in Estonia.

Web site.
Android and iOS app, and server.
License: MPL-2.0.
Development data in Cauldron.io.
Development repositories:
- TEHIK/hoia Koodivaramu GitLab project.

Inmuni App

Officially recommended in Italy.

Web site.
Android and iOS app, and server.
License: AGPLv3.
Development data in Cauldron.io.
Development repositories:
- immuni-app GitHub organization

Koronavilkku

Officially recommended in Finland.

Web site.
Android and iOS app, and server.
License: EUPL-1.2.
Development data in Cauldron.io.
Development repositories:
- THLfi/koronavilkku-android GitHub repository
- THLfi/koronavilkku-ios GitHub repository
- THLfi/koronavilkku-backend GitHub repository

NHS COVID-19 App

Officially recommended in UK.

Web site.
Android and iOS apps, and server.
License: MIT.
Development data in Cauldron.io.
Development repositories:
- nhsx/covid-19-app-android-ag-public GitHub repository
- nhsx/covid19-app-system-public GitHub repository
- nhsx/covid-19-app-ios-ag-public GitHub repository
- nhsx/covid-19-app-configuration-public GitHub repository
- nhsx/COVID-19-app-Documentation-BETA GitHub repository
- nhsx/COVID-19-app-iOS-BETA GitHub repository
- nhsx/COVID-19-app-Android-BETA GitHub repository

OpenTrace

Reference implementation of TraceTogether, recommended in Singapore (notice: this code does not correspond to the apps being distributed as TraceTogether).