Add Plane to Software Development - Project Management (#3735)

README.md

@@ -1900,6 +1900,7 @@ _See also: [awesome-sysadmin/Code Review](https://github.com/awesome-foss/awesom
 - [Party Poker](https://github.com/kksoftwareag/partypoker) - Agile / Scrum Planning Poker WebApp. Estimate User Stories in real time. ([Demo](https://planningpoker.party)) `MIT` `C#`
 - [Phorge](https://we.phorge.it/) - Phorge is an open source, community driven platform for collaborating, managing, organizing and reviewing software development projects. ([Source Code](https://we.phorge.it/source/phorge/)) `Apache-2.0` `PHP`
 - [Phproject](https://www.phproject.org/) - High performance full-featured project management system. ([Source Code](https://github.com/Alanaktion/phproject)) `GPL-3.0` `PHP`
+- [Plane](https://plane.so) - Open Source JIRA, Linear and Height Alternative. Plane helps you track your issues, epics, and product roadmaps in the simplest way possible. ([Demo](https://app.plane.so), [Source Code](https://github.com/makeplane/plane)) `Apache-2.0` `Docker`
 - [ProjeQtOr](https://www.projeqtor.org/) - A complete, mature, multi-user project management system with extensive functionality for all phases of a project. ([Demo](https://demo.projeqtor.org/), [Source Code](https://sourceforge.net/p/projectorria/code/HEAD/tree/branches/)) `AGPL-3.0` `PHP`
 - [Redmine](https://www.redmine.org/) - Redmine is a flexible project management web application. ([Demo](http://demo.redmine.org/), [Source Code](https://svn.redmine.org/redmine/)) `GPL-2.0` `Ruby`
 - [RhodeCode](https://rhodecode.com/) - RhodeCode is an open source platform for software development teams. It unifies and simplifies repository management for Git, Subversion, and Mercurial. ([Source Code](https://code.rhodecode.com/)) `AGPL-3.0` `Python`