Planning poker- RTC widget
One answer
I am not a widget developer. You can find some bits and pieces, if you google hard enough. There are some examples you could look at in the Jazz Community: https://github.com/jazz-community?q=widget&type=all&language=&sort=
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Please note, that for EWM/RTC/JTS, you have to create a server extension that needs to be deployed on the server.
AFAIK you can also try to develop an open social gadget, that you can then deploy. There is a documentation for how to do that (not an IBM description). For Doors Next there is a way to manage a registry. Maybe https://rsjazz.wordpress.com/2016/03/02/alien-skies-peeking-into-doors-next-extensibility/ is a good entry point for that.