This page contains links to various online resources for TokuDB.
Tokutek was the primary developer of TokuDB before being acquired by Percona. Their website.
Percona's TokuDB Documentation
There were two TokuDB specific mailing lists run by Tokutek:
These were discontinued and redirected to Percona's MySQL and MariaDB forum.
The following link will take you to the
#tokutek channel using Freenode's web IRC client:
The Where to find other MariaDB users and developers page has many great MariaDB resources listed.