Ebookshare: Provides link to either an e-books torrent files or direct download to the file itself.  E-books are categorized into broader subject and the site has a nice search engine to aid you in finding the e-book you want. (来源：专业英语学习网站 http://www.EnglishCN.com)

Ebookee: A free book search engine. Ebookee helps you in finding e-book titles that you are particularly looking for.  The E-books listed on the site are organized in general subject categories.

Wowio: The site lets you access legally available high-quality e-books. Wowio lets you read complete books online for free. If you want to download the PDF versions, Wowio charges a minimal fee. 

Internet Archive – With the aim of building an Internet Library, this site features texts, audio, moving images, and software as well as archived web pages in its  collections. 

Clipart

Open Clip Art Library:   The site is an ongoing project to create an archive of user contributed database of clip art that can used freely. Open Clip Art Library upholds the Creative Commons and encourages users to participate in generating contents.

WP Clipart: Offers more than 29000 public domain clip art images which were designed specifically for use with Word Processors. WP Clipart provides thousands of color graphic clips, illustrations, photographs and black and white line art in lossless, PNG format.

Clker:  The site offers royalty free clip art in SVG, ODG and PNG format which are in public domain. It lets you easily embed these images in openoffice documents.

Clipart.com: The web’s largest collection of royalty-free clipart, vinyl-ready images, photos, web graphics, fonts, illustrations, and sounds. Clipart offers paid subscription to its database containing 10 million+ professional-quality images in various formats including .EPS, .JPG, .PNG, and .WMF.

Download Hubs

Softpedia:  The site contains more than 500,000 sofware programs Windows, Unix/Linux, Mac, Mobile Phones, Games and Drivers. Some of software programs in Softpedia are freeware while some are shareware.

Download.com: Cnet’s most comprehensive library of freeware offers free download.  Download.com contains tons of Windows software ranging from security software, digital photo software, educational software and more.

Open Source Mac:  A handy reference and useful tools that encourages users to utilize free and open-source software..  Open Source Mac offers a simple list of  the best and free software for the Mac OS X.

Free Downloads Center: Hosts a collection of free software, games and other desktop goodies which you can download for free. Free Downloads Center also offers a Give Away of the Day licensed software which you can download during the day only.

Tucows: The web’s original software download site. Tucows contains more than 40,000 software titles which are freeware or shareware.

Phazeddl: Hosts download warez, games, torrents, movies, software, apps, scripts, TV shows, ebooks, templates as well as key-gen of crack softwares.

Freeware

A+Freeware:  The site offers choice applications or “A+Freeware” which become useful only when combined with a valid operating system. A+Freeware lets you get copies of software for free.

Best Freeware Download: A free wares site which allows you to register and save links on the site’s member account areas. Best Freeware Download is categorized into communication desktop and games. Gamers would definitely want to check this site from time to time to check on new freewares to be added.

Free Ware Box: The site offers categorized summary of freeware software. Freeware Box contains open source software, public domain and other types of free software, all available for free download.

Freeware Zoom:  This site offers freeware for free download. Freeware Zoom is updated daily and it contains no adware or spyware.

File Hippo:  The site has considerable number of freeware, demo and shareware programs which are of high quality. File Hippo puts a premium on quality software rather than quantity. Hence the site offers only the best software.