When you purchase a tweecer or tweecer RT, you are only buying the HARDWARE.
The software supplied with the tweecer is free to download from the tweecer site...
http://www.tweecer.com/downloads.htm
The 'editor' on the tweecer site is called CalEdit.
The datalogger on the tweecer site is called CalCon.
Both of these software programs had several glitches, and it was starting to look like they would never be fixed. They didn't make the software unusable... just tougher to work with.
This is where BinEditor comes in.
BinEditor is a single program that incorporates both the editor and the datalogger.
EECAnalyzer (aka EA), is a separate program that is used to analyze datalogs and make reasonable suggestions for tune changes.
The creator of BE/EA is a fellow Mustang enthusiast who is pretty active in the continued development of the software.
More info can be found here...
http://eecanalyzer.net/
Both can be purchased here...
http://eecanalyzer.net/downloads/
EDIT:
I have edited the first 2 posts in this thread, as they contained some glaring errors...