Jenkins is a free and open source automation server. It helps automate the parts of software development related to building, testing, and deploying, facilitating continuous integration and continuous delivery. It is a server-based system that runs in servlet containers such as Apache Tomcat.

Redis is in-memory data structure store, used as a distributed, in-memory key–value database, cache and message broker. It supports different kinds of abstract data structures like sorted sets, HyperLogLogs, bitmaps, strings, lists, maps, sets, streams, and spatial indexes

Apache CouchDB is an open-source NoSQL database and it is implemented in Erlang. CouchDB uses JSON to store data, JavaScript as a query language. It applies multiple formats and protocols to store, transfer, and process its data

Rabbitmq is an open-source message-broker software (also called message-oriented middleware) which implemented the Advanced Message Queuing Protocol and was extended with a plug-in architecture to support Streaming Text Oriented Messaging Protocol, MQ Telemetry Transport, and other protocols. Server program is written in the Erlang programming language and is built on the Open Telecom Platform framework for clustering and failover. Broker interface with cleint libraries are available for all leading programming languages

MongoDB is a source-available cross-platform document-oriented database program. MongoDB uses JSON-like documents with optional schemas as it is classified as a NoSQL database program

MySQL is in-memory data structure store, used as a distributed, in-memory key–value database, cache and message broker. It supports different kinds of abstract data structures like sorted sets, HyperLogLogs, bitmaps, strings, lists, maps, sets, streams, and spatial indexes

PostgreSQL (also known as Postgres), is a free and open-source relational database management system (RDBMS) emphasizing extensibility and SQL compliance. PostgreSQL features transactions with (ACID) properties - Atomicity, Consistency, Isolation, Durability, automatically updatable views, materialized views, triggers, foreign keys, and stored procedures. It is designed to handle a wide range of jobs, from single machines to data warehouses or Web services with many concurrent users.

Grafana is open source analytics and interactive visualization web application. When connected to supported data sources, it provides graphs, charts, alerts for the web

HackMD is a collaborative markdown editor. Users are allowed to share, comment, and collaborate on documents. Users can choose between using the online platform or installing it as a local service using the upstream project CodiMD

phpMyAdmin is an administration tool for MySQL and MariaDB. It is written in PHP, as a web application, it is considered one of the most popular MySQL administration tools, especially for web hosting services

Consul is a service discovery and configuration system. It is used to present services and nodes in a flexible and powerful interface that allows clients to always have an infrastructure view in real time

GitLab is a web-based DevOps lifecycle tool that provides a Git-repository manager providing wiki, issue-tracking and continuous integration and deployment pipeline features, using an open-source license, developed by GitLab Inc.

Gogs is a self hosted Git service it is written in Go. It can be used for all platforms that Go supports, including Linux, macOS, Windows and ARM

Gitea is an open-source software package which is used for hosting software development version control by using Git. It has also other features like bug tracking, wikis and code review. It is used to support self-hosting but also provides a free public first-party instance