Revit Content Online

A great list of Revit family content from the LinkedIn Revit Users group:

Parveen S. • Our team have been using all these website whenever required.
I hope you’ll find this information useful.

http://seek.autodesk.com/http://www.caddetails.com/ (requires registration)
http://www.cadforum.cz/catalog_en/?fo=RFA (Requires registration)
http://www.usgdesignstudio.com/default.asphttp://www.revitcity.com/index.phphttp://revitcomponents.blogspot.com/http://www.revitfamilyman.com/new3revitfotwpage.htmhttp://www.turbosquid.com/Revit (for a fee)
http://www.augi.comhttp://www.arcat.com/bim/bim_objects.shtmlhttp://www.jeld-wen.com/http://www.kolbe-kolbe.com/http://www.strongtie.com/drawings/revit.asphttp://www.symbolmachine.com/http://revitfactory.com/http://www.formfonts.com/http://www.broutek.com/http://www.revit-content.com/http://www.revitstore.com/http://www.reedconstructiondata.com/bim/bim-object-creation/http://www.smartbim.com
MEP objects(some of the links might be outdated): from AUGI:
http://forums.augi.com/showthread.php?t=99663
Acuity Brands Lighting
http://www.acuitybrandslighting.com/BIM
American Standard
http://www.americanstandard-us.com/resources/
A.O. Smith
http://www.hotwater.com/lit/revit.html
Applied Air
http://appliedair.com/building-information-modeling-bim.asp

ClimateMaster
http://www.climatemaster.com/index/comm_literature
Focal Point
http://www.focalpointlights.com/resources/BIM.html
Greenheck
http://www.greenheck.com/drawings/
Kohler
http://www.us.kohler.com/tech/cadsymbol/cadsymbol.jsp? (Revit families @ bottom of page)

Lightolier
http://www.lightolier.com/resources/downloads.jsp#BIM
LJ Wing | Heating & Makeup Air Equipment

http://www.ljwing.com/building-information-modeling-bim.asp
Sierra | Fresh Air Systems
http://www.sierra-fas.com/building-information-modeling-bim.asp
Temprite Industries

http://www.tempriteheating.com/building-information-modeling-bim.asp
Loren Cook
http://www.lorencook.com/About/destools.shtml
Marley
http://spxcooling.com/en/about/detail/revit-files/
McQuay
http://www.mcquay.com/McQuay/BIM/Revit-BIMFiles
Mono-Systems
http://www.monosystems.com/revit.asp
Price
http://www.price-hvac.com/software/revit
Ruskin
http://www.ruskin.com/revit.aspx
Siemon
http://www.siemon.com/us/download/bim.asp
Victaulic
http://www.victaulic.com/content/autodeskrevit.htm
Visa Lighting
http://www.visalighting.com/site/resources/bim-building-information-modeling
Watts Regulator | Watts Water Technologies Inc

http://www.watts.com/pro/whatsnew/whatsnew_3dCAD.asp
York
http://rezine.net/http://andekan.com/http://www.broutek.com/http://www.cadworks.net/Revit.htmhttp://smartbim.reedconstructiondata.com/
RPC Content
http://www.archvision.com/
USG Wall Systems
http://www.usgdesignstudio.com/wallselector.asp
Kawneer Curtain Wall Systems
http://www.kawneer.com/kawneer/north_america/en/bim.asp
Titus
http://www.titus-hvac.com/software/Revit.asp
Woodwork Institute – Casework
http://www.woodworkinstitute.com/publications/casework.asp
Lochinvar Boilers/Water Heaters:
http://lochinvar.com/products/documentation.aspx?mode=filetype&filetypeid=22
Taco pumps & accessories:
http://www.taco-hvac.com/revit.html
TurboSquid
http://www.turbosquid.com/Revit (fee-based)
Reed Construction | SmartBIM Library
http://www.reedconstructiondata.com/bim/bim-library/ (fee-based)
Yellowbryk
http://www.yellowbryk.com/index.html (fee-based)
the list can have few more website.
though this is good enough. If you don’t find required content, create it. :)