With the release of version 5.0 Tabulator has undergone a complete rebuild of the codebase.
As Tabulator has grown in complexity and size, so has its codebase, making it harder to maintain and test and very big to download. In this release all of these issues have been addressed.
This release also aims to make Tabulator more accessible to developers, opening up the code and making it easier for you to built your own modules for the table.
Checkout the Release Notes for full details