Added Solr to Misc/Other. (#3003)

README.md

@@ -1272,6 +1272,7 @@ _See also: [List of streaming media systems - Wikipedia](https://en.wikipedia.or
 - [revealjs](https://revealjs.com) - Framework for easily creating beautiful presentations using HTML. ([Demo](https://revealjs.com/), [Source Code](https://github.com/hakimel/reveal.js)) `MIT` `Javascript`
 - [Revive Adserver](https://www.revive-adserver.com/) - World's most popular free, open source ad serving system. Formerly known as OpenX Adserver and phpAdsNew. ([Source Code](https://github.com/revive-adserver/revive-adserver)) `GPL-2.0-or-later` `PHP`
 - [SANE Network Scanning](http://sane-project.org/) - Allow remote clients to access image acquisition devices (scanners) available on the local host. ([Source Code](http://www.sane-project.org/cvs.html)) `GPL-2.0` `C`
+- [Apache Solr](https://lucene.apache.org/solr/) - Solr is the popular, blazing-fast, open source enterprise search platform built on Apache Lucene. ([Source Code](https://lucene.apache.org/solr/downloads.html)) `Apache-2.0` `Java`
 - [string.is](https://string.is/) - An open-source, privacy-friendly online string toolkit for developers. ([Source Code](https://github.com/recurser/string-is)) `AGPL-3.0` `Nodejs`
 - [TeslaMate](https://github.com/adriankumpf/teslamate) - A powerful data logger for Tesla vehicles. `MIT` `Elixir`
 - [Trello Burndown](https://github.com/mtricht/trello-burndown) `⚠` - Easy to use SCRUM burndown chart for Trello boards. `MIT` `Go/Docker`