Acceler Forums is a full-featured forum solution that is secured using PHP PDO statements. 

This forum solution has many useful features that let you customize your forum at maximum ability, this includes; 

custom roles, easy category & sub-category creation, create & save multiple themes, profile subscribing, easy featuring, sticking posts & so much more!

Features: 
-PDO Security
-Spam Filter
-Messaging
-Custom Roles
-Online Now Status
-Featured & Stickied Posts
-Customizable Themes 
-Members can follow each other (subscriber system)
-Customizable Profiles
-Shop