Linux Ubuntu
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-Ubuntu is a community developed, Linux-based operating system that is perfect for laptops, desktops and servers.
-It contains all the applications you need - a web browser, presentation, document and spreadsheet software, instant messaging and much more.
-Ubuntu will always be free of charge, including enterprise releases and security updates.
-Ubuntu CDs contain only free software applications; we encourage you to use free and open source software, improve it and pass it on.
Download Free CD:Link1(direct) or Link2

TrueCrypt
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-Free Open-Source Disk Encryption Software:
-Creates a virtual encrypted disk within a file and mounts it as a real disk.
-Encrypts an entire partition or storage device such as USB flash drive or hard drive.
-Encrypts a partition or drive where Windows is installed (pre-boot authentication).
-Encryption is automatic, real-time (on-the-fly) and transparent.
-Provides two levels of plausible deniability, in case an adversary forces you to reveal the password:
1) Hidden volume (steganography) and hidden operating system.
2) No TrueCrypt volume can be identified (volumes cannot be distinguished from random data).
-Encryption algorithms: AES-256, Serpent, and Twofish. Mode of operation: XTS.
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The leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more.
It is available in many languages and works on all common computers.
It stores all your data in an international open standard format and can also read and write files from other common office software packages.
It can be downloaded and used completely free of charge for any purpose.
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Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats

Open, edit, and save documents, workbooks, and presentations in the file formats new to Microsoft Office Word, Excel, and PowerPoint 2007.

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Quranflash :
Read online the Holy Qur'an using your fingertips.
LINK