I'm doing a webinar on Tuesday. WebinarJam or Easy Webinar. They look to be from the same guys, but do you need to purchase them both?

Webinar Jam is for live webinars and Easy Webinar is for evergreen (pre-recorded) webinars.  They are separate products for separate uses.  We go over these, and a few other tools, in Module 17.  Go there to grab a tool/resource guide for creating webinars.