rn-48: Add Gitbase and remind about Gitana in "Git tools and sites"

Author: jnareb

rev_news/drafts/edition-48.md

@@ -292,6 +292,22 @@ __Git tools and sites__
  to draw on your GitHub contribution graph; there is also
 [GitHub Spray Generator](https://annihil.github.io/github-spray-generator/) service.
 
+*[gitbase](https://github.com/src-d/gitbase) from source{d} is a tool (in alpha) providing
+[SQL interface to Git repositories](https://docs.sourced.tech/gitbase), written in Go.
+ It is part of [source{d} Engine](https://sourced.tech/engine), and implements MySQL wire protocol.
+ Uses [go-git](https://github.com/src-d/go-git) for accessing Git repositories,
+[go-mysql-server](https://github.com/src-d/go-mysql-server) for the SQL engine implementation,
+[enry](https://github.com/src-d/enry) for programming language detection for files,
+ and [bblfhs](https://github.com/bblfsh) for source code parsing into AST (Abstract Syntax Tree).
+ There is also a [web client](https://github.com/src-d/gitbase-web) for it.
+
+*[Gitana](http://modeling-languages.com/gitana-a-sql-based-git-repository-inspector/): a SQL-based Project Activity Inspector,
+ written in Python ([GitHub reposiotory](https://github.com/SOM-Research/Gitana)),
+ was mentioned in [Git Rev News Edition #7](https://git.github.io/rev_news/2015/09/09/edition-7/#other-news).
+ Nowadays it imports and digests the data of Git repositories, issue trackers (including Bugzilla and GitHub),
+ Q&A web-sites (including forums and StackOverflow) and instant messaging services to a relational database
+ in order to ease browsing and querying activities with standard SQL syntax and tools.
+
 
 ## Credits