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The "main file" of the third repository, according to https://www.odoo.com/documentation/16.0/administration/install/install.html, seems to be https://github.com/odoo/odoo/blob/16.0/odoo-bin
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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For the first repository, gnucash, it appears to be a C++ application. The common convention for a C++ app is to have the "main()" function inside a source file with the same name as the library, e.g. "gnucash.cpp". And sure enough, here it is. If I didn't think to guess that it was in that file, I could always just download the repository and do a CTRL-F for "main(". That would lead me to it immediately.
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A good example of such a repository would be Tailwind Elements:
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