Brandmeister TalkGroup 3148 (Texas) – https://www.facebook.com/groups/158270421244005/?ref=bookmarks

Houston Digital Radio – https://www.facebook.com/groups/HoustonDigitalRadio/

TYT MD 380 – https://www.facebook.com/groups/992967007380548/?fref=nf

DVMega BlueDV – https://www.facebook.com/groups/1670919469827393/

DVMega BlueStack – https://www.facebook.com/groups/287266488319271/

BlueDV iOS –  https://www.facebook.com/groups/313455825707900/

BlueDV Windows – https://www.facebook.com/groups/1744416682494846/

BlueDV Android – https://www.facebook.com/groups/270169350000583/

OpenSpot – https://www.facebook.com/groups/OpenSpotUsers/

TYT Radios – https://www.facebook.com/groups/TYTradioGroup/

Check for files that are available on most of these sites.  I am sure there are many other sites.  Don’t forget YouTube for lots of DMR information and demonstrations.