Apt Crowd Forums

Apt Crowd, LLC is proud to provide hosting services to some of the most innovative user groups in the Gas Turbine industry.


501D5-D5a Users Group

Private forum and website for owners and/or operators of 501D5 or D5A combustion turbines.


501f Users Group, Inc.

The official online community for owners and operators of 501F generators. Members are directly involved in construction, ownership, operation, and/or maintenance of Siemens, Westinghouse and Mitsubishi 501F, 701F, and SGT6-5000F gas turbines.


The User Group Leaders Forum

A private online forum for user group leaders to discuss conference planning, attracting and collaborating with board members, legal/organization issues, what works/doesn’t work, and anything else useful to the administration and operation of their groups.