By default RAMADDA serves up all of its HTML resources (javascript, css, images etc) from its own server. However, for performance, RAMADDA can be configured to use external content delivery networks (CDN) by setting this property:
ramadda.cdnok=true
For the core resources RAMADDA uses cdn.jsdeliver.net using the latest Github version tag, e.g.:
https://cdn.jsdelivr.net/gh/geodesystems/ramadda@6.60.0/...
For other resources RAMADDA uses the standard CDN for the resource, e.g.:
https://code.jquery.com/jquery-3.3.1.min.js

RAMADDA supports embedding Github checkins into wiki text with the form:
@(github user=some_user_name)  
or:
@(github owner=repository_owner repository=repository)
The access to the Github API is rate limited. To increase the request rate create a personal access token through Github and set the following RAMADDA property:
github.token=your token

Install the Ghostscript package to automatically generate a thumbnail image of the the page of a PDF file by setting the property:
service.gs=/path/to/bin/gs

RAMADDA supports a Jupyter Notebook entry type. It will do its own custom rendering of the notebook. You can also configure RAMADDA to use jupyter to do the rendering by setting the following property value:
ramadda.jupyter.path=/path/to/anaconda/bin/jupyter

There are a number of other services that access external APIs and require an API key. Here are some of them.
#show google streetview images
google.streetview.key=

#for google geocoding
google.key=

#For route generation in the editable maps using here.com routing API
#from https://www.here.com/
here.key=

#For geocoding from https://www.geocod.io/
geocodeio.key=


#For accessing purple air sensor data
#https://www2.purpleair.com/
purpleair.api.key=

#for enabling sms access
twilio.accountsid=
twilio.authtoken=
twilio.phone=

#for census data access
census.api.key=

#bureau of labor statistics
bls.api.key=

#fec
fec.api.key=


#used in the GTFS displays
ramadda.uber.token=
ramadda.lyft.clientid=
ramadda.lyft.secret=

#other...
quandl.api.key=
webhose.api.key=
enigma.api.key=
wolfram.api.key=