TrueCrypt - Open Source System Security

TrueCrypt is a Free open-source disk encryption software for Windows 7/Vista/XP, Mac OS X, and Linux. It can create a virtual encrypted disk within a file or encrypt a partition or (under Microsoft Windows except Windows 2000 and Windows 8 with GPT) the entire storage device (pre-boot authentication).

KDE Partition Manager

Open Source Disk Partition Tool

Easily manage disks, partitions and file systems on your KDE Desktop: Create, resize, move, copy, back up, restore or delete partitions.
Easily manage disks, partitions and file systems on your KDE Desktop: Create, resize, move, copy, back up, restore or delete partitions.

OpenBravo POS - Open Source Point Of Sale

OpenBravo POS is the leading open source Point-of Sale application for the SMBs in the retail industry. With almost 10,000 installations per month, it is proven to be a reliable alternative to expensive POS software. Merchants can save time & money by deploying OpenBravo POS with the native planet Authorize.Net payment gateway module. It is designed for touch screens, supports ESC/POS ticket printers, customer displays and barcode scanners.

Lemon POS- Open Source Point Of Sale

Lemon is an open source Point Of Sale software for micro, small & medium businesses. MySQL is employed for data management and storage, and can be used a single database with man POS terminals on a network. Being Linux or any other Unix the target operating system, your information is safer against virus attacks, and lowers the cost in licenses.