Adding link for inventree demo (#3613)

The DMA is a tiny MTA that works on FreeBSD/FreeNAS.
It lacks of many features but still can be used for a basic self hosted email server.

README.md

@@ -426,6 +426,7 @@ Simple deployment of [E-mail](https://en.wikipedia.org/wiki/Email) servers, e.g.
 
 - [chasquid](https://blitiri.com.ar/p/chasquid/) - SMTP (email) server with a focus on simplicity, security, and ease of operation. ([Source Code](https://blitiri.com.ar/git/r/chasquid/)) `Apache-2.0` `Go`
 - [Courier MTA](https://www.courier-mta.org/) - Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services. ([Source Code](https://www.courier-mta.org/repo.html)) `GPL-3.0` `C`
+- [DragonFly](https://github.com/corecode/dma) - A small MTA for home and office use. Works on Linux and FreeBSD. `BSD` `C`
 - [Exim](https://www.exim.org/) - Message transfer agent (MTA) developed at the University of Cambridge. ([Source Code](https://git.exim.org/exim.git)) `GPL-3.0` `C`
 - [Haraka](https://haraka.github.io/) - High-performance, pluginable SMTP server written in Javascript. ([Source Code](https://github.com/haraka/Haraka)) `MIT` `Nodejs`
 - [MailCatcher](https://mailcatcher.me/) - Ruby gem that deploys a simply SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development. ([Source Code](https://github.com/sj26/mailcatcher)) `MIT` `Ruby`
@@ -1017,6 +1018,7 @@ Multiplayer game servers and [browser games](https://en.wikipedia.org/wiki/Brows
 - [Posio](https://github.com/abrenaut/posio) - Geography multiplayer game. `MIT` `Python`
 - [QuakeJS](https://github.com/begleysm/quakejs) - QuakeJS is a port of ioquake3 to Javascript that can be played in a browser. `MIT` `Nodejs`
 - [Quizmaster](https://github.com/nymanjens/quizmaster) - A web-app for conducting a quiz, including a page for players to enter their answers. `Apache-2.0` `Scala`
+- [Red Eclipse 2](https://redeclipse.net) - A FOSS Arena First-Person Shooter Similar to Unreal Tournament. ([Source Code](https://github.com/redeclipse/base)) `Zlib/MIT/CC-BY-SA` `C/C++` 
 - [SourceBans++](https://sbpp.dev/) - Admin, ban, and communication management system for games running on the Source engine. ([Source Code](https://github.com/sbpp/sourcebans-pp)) `CC-BY-SA-4.0` `PHP`
 - [Teeworlds](https://www.teeworlds.com) - Open source 2D retro multiplayer shooter. ([Source Code](https://github.com/teeworlds/teeworlds)) `Zlib` `C++`
 - [The Battle for Wesnoth](https://github.com/wesnoth/wesnoth) - The Battle for Wesnoth is an Open Source, turn-based tactical strategy game with a high fantasy theme, featuring both singleplayer and online/hotseat multiplayer combat. `GPL-2.0` `C++`
@@ -1374,7 +1376,7 @@ _See also: [awesome-sysadmin/IT Asset Management](https://github.com/awesome-fos
 - [Hub20](https://hub20.io/) - A self-hosted payment processor for Ethereum and ERC20 Tokens. ([Source Code](https://gitlab.com/mushroomlabs/hub20/)) `AGPL-3.0` `Docker/Python`
 - [IHateMoney](https://ihatemoney.org/) - Manage your shared expenses, easily. ([Demo](https://ihatemoney.org/demo/), [Source Code](https://github.com/spiral-project/ihatemoney)) `BSD-3-Clause` `Docker/Python`
 - [Inventaire](https://inventaire.io/welcome) - Collaborative resources mapper project, while yet only focused on exploring books mapping with wikidata and ISBNs. ([Source Code](https://github.com/inventaire/inventaire)) `AGPL-3.0` `Nodejs`
-- [Inventree](https://inventree.readthedocs.io/en/latest/) - InvenTree is an open-source inventory management system which provides intuitive parts management and stock control. ([Source Code](https://github.com/inventree/InvenTree)) `MIT` `Python`
+- [Inventree](https://inventree.readthedocs.io/en/latest/) - InvenTree is an open-source inventory management system which provides intuitive parts management and stock control. ([Demo](https://inventree.org/demo), [Source Code](https://github.com/inventree/InvenTree)) `MIT` `Python`
 - [Invoice Ninja](https://www.invoiceninja.org/) - Powerful tool to invoice clients online. ([Demo](https://app.invoiceninja.com/invoices/create), [Source Code](https://github.com/invoiceninja/invoiceninja)) `AAL` `PHP`
 - [InvoicePlane](https://github.com/InvoicePlane/InvoicePlane) - Manage quotes, invoices, payments and customers for your small business. `MIT` `PHP`
 - [Kresus](https://kresus.org/) - Open source personal finance manager. ([Demo](https://kresus.org/en/demo.html), [Source Code](https://github.com/kresusapp/kresus)) `MIT` `Nodejs`
@@ -1895,7 +1897,7 @@ _See also: [awesome-sysadmin/Code Review](https://github.com/awesome-foss/awesom
 - [Traq](https://traq.io/) - Project management and issue tracking system written in PHP. ([Source Code](https://github.com/nirix/traq)) `GPL-3.0` `PHP/Nodejs`
 - [Tuleap](https://www.tuleap.org/) - Tuleap is a libre suite to plan, track, code and collaborate on software projects. ([Source Code](https://tuleap.net/plugins/git/tuleap/tuleap/stable?p=tuleap%2Fstable.git&a=tree)) `GPL-2.0` `PHP`
 - [UVDesk](https://www.uvdesk.com/) - UVDesk community is a service oriented, event driven extensible opensource helpdesk system that can be used by your organization to provide efficient support to your clients effortlessly whichever way you imagine. ([Demo](https://demo.uvdesk.com/), [Source Code](https://github.com/uvdesk/community-skeleton)) `MIT` `PHP`
-- [ZenTao](https://www.zentao.pm/) - An agile(scrum) project management system/tool. ([Source Code](https://github.com/easysoft/zentaopms)) `AGPL-3.0` `PHP`
+- [ZenTao](https://www.zentao.pm/) - An agile(scrum) project management system/tool. ([Demo](https://demo15.zentao.pm/), [Source Code](https://github.com/easysoft/zentaopms)) `AGPL-3.0` `PHP`
 
 
 ### Software Development - Testing
@@ -1904,6 +1906,7 @@ _See also: [awesome-sysadmin/Code Review](https://github.com/awesome-foss/awesom
 
 Tools and software for [software testing](https://en.wikipedia.org/wiki/Software_testing).
 
+- [Bencher](https://bencher.dev/) - Bencher is a suite of continuous benchmarking tools designed to catch performance regressions in CI. ([Source Code](https://github.com/bencherdev/bencher)) `MIT/Apache-2.0` `Rust`
 - [DeepfakeHTTP](https://github.com/xnbox/DeepfakeHTTP) - A web server that uses HTTP dumps as a source for responses. `MIT` `Java`
 - [Selenoid](https://aerokube.com/selenoid/latest/) - Lightweight Selenium hub implementation launching browsers within Docker containers. ([Source Code](https://github.com/aerokube/selenoid)) `Apache-2.0` `Go`
 - [Sorry Cypress](https://sorry-cypress.dev) - Alternative open-source dashboard for the Cypress browser automation framework, featuring unlimited parallelization, recording and debugging of tests. ([Source Code](https://github.com/sorry-cypress/sorry-cypress)) `MIT` `Typescript`