** found I had wasted my time as I am looking for an open source solution. **
I think you must be confused. "Open source" simply means that the source code is not encrypted in any way which would allow you to make changes to it if you wanted or look at exactly how the code works. If you ever decide to work with CalendarScript, I think you'll find it is one of the most open applications available with it's plug-in abilities (see the following link) which allow users to easily enhance it functioning.
LINK > Unofficial CalendarScript - Mods and Plugins site
I don't know about the "free/$85" listing but I assume it means that it is free to download and try so you can see if it will meet your needs. Many as well developed programs you need to pay for upfront before you even know if you'll be able to utilize them.
If you're just looking for a FREE solution, I suggest you look for "freeware" programs not "shareware".
JMO
Dan O.
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