If you look on the bottom of HUD.com it says:"HUD.com is not affiliated with or endorsed by the U.S.

You can share documents (invoices, quotes, spreadsheets), make video and voice calls... it does it all.And no I do not work for them or have any affiliation, Im an IT professional / house flipper who just thinks it would be a great solution.Good luck!

RocketLawyer has templates on their websites and you get a document free (I am not affiliated with them but have used their services before).

Is someone considered a private lender if they are not affiliated with a bank, but work for a mortage LLC company, or can they still be a conventional lender?

I am not affiliated with this company.

If you want to do an amendment to do something simple like change the buyer name to an affiliated entity, or extend closing date for a valid reason, they'll do it.  

For example, this post from EquityMultiple is quite thorough (though you should always recognize the platforms will highlight the positive things about their particularly fee structure while minimizing the downsides).As @Mark Robertson pointed out, whether the site offers 506(b) or 506(c) investment can make a difference as well, and it's also important whether or not the site is registered broker-dealer or not (many, like Equity Multiple, are not broker-dealers themselves, but have contractual affiliate relationships with broker-dealers to offer the actual securities). 

The best paid tool  I use is propertyradar. ( I have no affiliation with propertyradar)

I was leaning towards a DC Keller Williams brokerage I know of due to the strong training and positive feedback I got from a friend affiliated with them, but would like other suggestions before I commit. 

(I am not affiliated with them, except as a property owner.).