I want to create a simple IDE Expert for Delphi 7, like in the following image:
I've verified the links gave for this question but OTA Api newsgroup is dead, and most of the documentation is unavailable (broken links). Can someone give a starting point with this?
The image you provided is for CnPack IDE expert. It is an open-source tool. You can download its source code from the link below, and study it:
http://code.google.com/p/cnpack/downloads/list
BTW, AFAIK Galileo is project codename for Delphi 8 and newer IDE versions, not Delphi 7.
This is not an easy task, trying to create your own Expert. It takes some extensive knowledge of the delphi open Tools api (toolsapi.pas) \
Some good places to start to learn how to create an expert and/or use of the open tools api
http://www.davidghoyle.co.uk/WordPress/?p=11
http://www.gexperts.org/otafaq.html
http://www.gexperts.org/otafaq.html#sample
http://www.gexperts.org/otafaq.html#projectgroup
http://www.gexperts.org/otafaq.html#resource
There is lots more to be found with a google search of Delphi 7 + Open Tools API
Good Luck!