Unofficial BlueKai Debugge...
[TLDR] This extension aims to help Solr developers and users with queries. You can modify Solr queries, execute, debug and, very important, see the explain in a crystal clear format. Solr queries are full of short parameters, hard to read and modify, especially when the parameters are too many. And after all this, it is even harder to debug and understand why a document is more or less relevant than another. The Solr debug explain output is a three too big to fit in one page. Finally, in real world Solr queries are often generated by applications so it is really painful try to execute them. This plugin offers the ability to execute the queries and show the output in a human readable format. Parameters, documents, facets, debug, explain are well organised and structured.