A partner directory is a centralized database that features information about a company’s partners, including descriptions of their products and services. They can be used to:
There are many partner directories available that are powered by templated partner directory services. These share common language — one of which is "Find the right partner”.
If you search these two terms (+"Find the right" +"partner") in Google, many of the results will be partner directories. You can collect these partner directories, and search through the ones that are adjacent to or in your vertical. This is a fairly straightforward way to identify new referral and reseller partners.
Live examples: