Below is a list of some of the best presentation search engines.
1- PPT Search Engine
As its name suggests this is a free search engine where you can search for and find different Power Point presentations.
2- Slide Finder
This is another awesome search engine that provides thousands of slides .
3- Slide World
4- Presentation 2 Go
Presentation 2 Go lets you easily search and download Power Point presentation in Ppt slides.
Brupt is based on Google Custom Search Engine and allows users to search for different types of docs including Power Point.
7- Search Documents
This one here offers users the ability to search ,upload and share publicly or privately Power Point presentations, word documents and Adobe PDF Portfolios.
This is a community for people to find and share and all kinds of documents.
Issuu is a platform where users can publish, host, search for and download presentations and documents.