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2. Zamzar - Wikipedia

   en.wikipedia.org/wiki/Zamzar

   Zamzar is currently free to use, but there is a limit of two conversions per hour for files up to 100MB. Users can pay a monthly subscription in order to access preferential features, such as unlimited file conversions, online file management, shorter response and queuing times and other benefits.

3. Project Euler - Wikipedia

   en.wikipedia.org/wiki/Project_Euler

   Project Euler (named after Leonhard Euler) is a website dedicated to a series of computational problems intended to be solved with computer programs. [1] [2] The project attracts graduates and students interested in mathematics and computer programming.

4. Stack Overflow - Wikipedia

   en.wikipedia.org/wiki/Stack_Overflow

   A study from the University of Maryland found that Android developers that used only Stack Overflow as their programming resource tended to write less secure code than those who used only the official Android developer documentation from Google, while developers using only the official Android documentation tended to write significantly less ...

5. List of unsolved problems in computer science - Wikipedia

   en.wikipedia.org/wiki/List_of_unsolved_problems...

   The problem to determine all positive integers such that the concatenation of and in base uses at most distinct characters for and fixed [citation needed] and many other problems in the coding theory are also the unsolved problems in mathematics.

6. PDF24 Creator - Wikipedia

   en.wikipedia.org/wiki/PDF24_Creator

   PDF encryption, decryption and signing; Change PDF information (author, title, etc.) Compress and shrink PDF files; Add a watermark or stamp a PDF file; Combine pages with a digital paper; Convert to and from PDF; Multiple PDF printers for different purposes since 7.7.0; Full featured and lightweight PDF reader since version 8.7.0

7. AOL Mail is free and helps keep you safe.

   mail.aol.com/d?reason=invalid_cred

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!