Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail gateways. It provides a number of utilities including a flexible and scalable multi-threaded daemon, a command line scanner and advanced tool for automatic database updates. The core of the package is an anti-virus engine available in a form of shared library.

ClamAVis also available for Windows as the result of a partnership between Immunet Corporation and Sourcefire, Inc. It is designed to provide the ClamAV community with a free Windows-specific Anti-Virus (AV) solution using an advanced Cloud-based protection mechanism.

Smallest of all AV-applications: only 3.45MB download-file (32bit).

You can use ClamAV For Windows as a stand-alone, host-based AV solution, or in conjunction with your pre-installed AV solution to provide enhanced detection for the latest malware threats.

Double Commander is a cross-platform open source file manager with two panels side by side. It is inspired by Total Commander and features some new ideas.

Features
- Unicode support
- Tabbed interface
- Multi-rename tool
- Custom columns
- Built in file viewer (F3) to view files of in hex, binary or text format
- Internal text editor (F4) with syntax highlighting
- Archives are handled like subdirectories. You can easily copy files to and from archives. Supported archive types: ZIP, TAR GZ, TGZ, LZMA and also BZ2, RPM, CPIO, DEB, RAR.
- All operations working in the background
- Extended search function with full-text search in any files
- Configurable button bar to start external programs or internal menu commands
- Total Commander WCX, WDX, and WLX plug-ins support

VirtualBox is a general-purpose full virtualizer for x86 hardware, targeted at server, desktop and embedded use. VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers, it is also the only professional solution that is freely available as Open Source Software under the terms of the GNU General Public License (GPL) version 2.

Presently, VirtualBox runs on Windows, Linux, Macintosh, and Solaris hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista, Windows 7, Windows 8, Windows 10), DOS/Windows 3.x, Linux (2.4, 2.6, 3.x and 4.x), Solaris and OpenSolaris, OS/2, and OpenBSD.

VirtualBox is being actively developed with frequent releases and has an ever growing list of features, supported guest operating systems and platforms it runs on. VirtualBox is a community effort backed by a dedicated company: everyone is encouraged to contribute while Oracle ensures the product always meets professional quality criteria.

7-Zip is free software with open source. The most of the code is under the GNU LGPL license. Some parts of the code are under the BSD 3-clause License. Also there is unRAR license restriction for some parts of the code.

You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip.

• High compression ratio in 7z format with LZMA and LZMA2 compression
• Supported formats:
  • Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
  • Unpacking only: AR, ARJ, CAB, CHM, CPIO, CramFS, DMG, EXT, FAT, GPT, HFS, IHEX, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, QCOW2, RAR, RPM, SquashFS, UDF, UEFI, VDI, VHD, VMDK, WIM, XAR and Z.
• For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip
• Strong AES-256 encryption in 7z and ZIP formats
• Self-extracting capability for 7z format
• Integration with Windows Shell
• Powerful File Manager
• Powerful command line version
• Plugin for FAR Manager
• Localizations for 87 languages
• 7-Zip works in Windows 10 / 8 / 7 / Vista / XP / 2019 / 2016 / 2012 / 2008 / 2003 / 2000.
• p7zip - the port of the command line version of 7-Zip to Linux/Posix.

Here are some "selling points" of KeePass. To get a first impression, you can also have a look at some of the screenshots. If you don't know which edition to choose (1.x or 2.x), have a look at the editions comparison page.

Items prefixed with [1.x] only apply to KeePass 1.x, [2.x] only applies to KeePass 2.x.

• Strong Security
• Multiple User Keys
• Portable and No Installation Required, Accessibility
• Export To TXT, HTML, XML and CSV Files
• Import From Many File Formats
• Easy Database Transfer
• Support of Password Groups
• Time Fields and Entry Attachments
• Auto-Type, Global Auto-Type Hot Key and Drag&Drop
• Intuitive and Secure Clipboard Handling
• Searching and Sorting
• Multi-Language Support
• Strong Random Password Generator
• Plugin Architecture
• Open Source!