Comment by ajainy

For https://snapcx.io , I have been experimenting with freshdesk, zendesk and zoho too. In end, as we are simple startup, I decided to stick with

  - Straight email support 
  - asciidoc generated html pages for documentation https://snapcx.io/docs
  - self hosted contact us form. (it sends email to support)
  - free zendesk chat. (as of today, it's one or two chat request, which sends email to support email)
  - As we are selling API subscription, I am hosting swagger based api explorer. (simple html page) 
  - https://snapcx.io/addressValidationAPI

My current gap is more intuitive documentation, which has search functionality and also in-built api explorer. I believe readme.io has both but no customer support features.