It is possible to query the API to get programs, some users have managed to query a wide range of programs. This endeavor, should you choose to do by yourself, may take from several hours to several weeks. As for searching by author, having a link to the author's project page is sufficient.

Here's a program that can find programs with at least 10 upvotes 2 years and older.
https://www.khanacademy.org/computer-programming/real-ka-search/4900199339720704

Thanks for the suggestion, but I do not know the author's username or name. I just know the project name.

Cool, thanks! :3

Might I ask what it is? I may be able to help. :-)