Kindle is slowly becoming default device for reading books. A few good websites are converting old ebooks to Kindle-compatible formats. Below you will find a list of websites from where you can download free kindle books
Jungle-search.com is a search engine designed to find all sort of ebooks from Amazon. You can use it to find free kindle ebooks as well. In the price range’s from & to field enter 0. As of today, there are almost 29,000 free Kindle ebooks.
Project Gutenberg has largest collection of public domain books. These books are also available for kindle. Find book that interest you and download it on kindle for free. They have a very interesting section of Top 100 ebooks.
ManyBooks has around 29,000 free ebooks in their database. All them are available in Kindle format for free.
Feed Books provides thousands of free ebooks for kindle. eBooks listed under Public Domain and Original Books can be freely downloaded for kindle. Select your book and click on kindle from the download link.
Inkmesh is a search engine for finding free ebooks. Search can be filtered for kindle only from the left column navigation. Inkmesh is really fast and accurate.
Open Culture has listed around 300 free books which can be downloaded on Kindle. List includes fiction, non-fiction & poetry.