Update index.md

Added Data tool as 4-23

Author: shazooer

Diff for: index.md

@@ -110,6 +110,8 @@ This section is a list of ready-to-use solutions or tools that will help agencie
 
 4-22 [DataVizWiz](https://drupal.org/project/datavizwiz) - A [Drupal](http://drupal.org) module that provides a fast way to get data vizualizations online.
 
+4-23 [Tabula](http://tabula.technology/) - Tabula is a tool for liberating data tables locked inside PDF files. researchers use Tabula to turn PDF reports into Excel spreadsheets, CSVs, and JSON files for use in analysis and database applications.
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 ##5. Resources