PDF Search engine is a very simple but amazing search engine which lets you search ebooks and download them. It either gives you the direct link to download or it may give the torrent link, which can be downloaded using the torrent client.

It also provides a search extension which can be added to the Firefox search bar. The reason why we think its amazing because its very simple and lets you find ebooks very easily. Its certainly worth checking out.

[via MakeUseOf ]