Many times you are looking for software that does not exist.
A website where people can search for existing software requests and vote them up, or suggest new ones. It can be a small and simple to build WordPress plugin or a complex stand-alone software product.
Many times and in many different fields there are varying opinions as to how to do things. Let the crowds decide.
Allow users to suggest subjects they want to find out best practices about, like how much time to cook roast beef, what’s the best way to remove coffee stains, etc. Then allow others to write what they think are the best practices. Finally, let people vote what they think is the best practice.
To share the beauty of the many occurrences of straight lines and rectangular forms in our world, both natural and man-made.
A website where members can submit photos of beautiful examples of straight lines and rectangular forms. Visitors can vote and share to create top lists.
If these potential advertisers see that you have many fans that also like their brand, they might advertise with you. Good for you and your fans.
Have a constant voting section on your website where your fans can vote for any of the brands you list there, and also suggest a new brand to include in the list.