A universal command-line raw converter, compatible with a huge range of cameras. The source code is available here.

A command-line tool for reading and writing Exif, IPTC and XMP metadata. The Linux archive provided with the package contains the appropriate Perl library.

A workflow oriented photo retouching package for camera raw image development that is also a versatile asset manager for a range of popular image formats. Supports tagging and metadata editing, and enables automatic publishing to Facebook, Flickr and Picasa.

A fast viewer that supports a wide range of image formats. The software uses plug-ins to view multimedia content and can also be used to apply various effects to digital images.

A set of plug-ins for IrfanView, including support for PostScript, JPEG 2000 and various RAW formats

The portable version of the IrfanView image viewer. The program can be started directly from a USB stick, an iPod, an external hard disk or a CD.

The MacPorts project is an open source community initiative to design an easy-to-use system for compiling, installing and upgrading either command-line, X11 or Aqua-based open source software on the Mac OS X operating system. Includes various graphics programs, such as Autopano-SIFT and ImageMagick.

Recovers lost files and archives on hard disks, CDs, and memory cards. The manufacturer claims that it can even restore data from destroyed or reformatted systems. Supplied with TestDisk. The source code is available here.

A tool for creating cool portfolio websites and online galleries. The software is simple to use and provides a WYSIWYG editor that requires no knowledge of HTML or programing. There are 250 templates and an FTP client for creating an unlimited number of websites with up to 25 pages each.

Navigate to https://answers.websitex5.com/register to register for free use of the software. c’t Digital Photography readers receive a 40% discount on an in-app upgrade to the Evolution 11 version. Both of these offers are valid until October 15th, 2015.