User:CallerNo6/Stack

Meta (across projects)

Git

Trello (informally?)

MediaWiki

documentation

Transifex

i18n

Forums

currently PunBB, transitioning to Discourse

AcousticBrainz

Python / Flask

web site

Essentia

audio analysis tools

BookBrainz

Node.js / React

web site

Python / Flask

web service (but this is transitioning to node.js)

PostgresQL

CritiqueBrainz

Python/Flask

Postgresql

ListenBrainz

Python / Flask

Apache Cassandra / Kafka / Zookeeper

MusicBrainz Picard Tagger

Python

Mutagen

MusicBrianz Picard Website

Python / Flask

MusicBrainz Server

Perl

server code

Catalyst

web framework

Template Toolkit

page templates

Moose

object orientated perl extension

PostgresQL

JavaScript

CSS / Less

MusicBrainz Search Server

Java / Lucene (transitioning to Solr)

MusicBrainz & Cover Art Archive Client Libraries

C / C++

`

Userscripts (mainly for MusicBrainz editing)

Greasemonkey / Javascript