VUE (Visual Understanding Environment) is a free, open source mind mapping and data visualization software developed by the Academic Technology group at Tufts University in Boston. VUE is unique in that it offers a range of innovative functions such as tagging of nodes and of relationships, support for images, videos, and other objects within the mind map structure, and the ability to import and analyze datasets (from CSV files, XML files, and even RSS feeds) using semantic mapping. It also functions as an innovative Powerpoint-style presentation tool, allowing users to define “presentation pathways” on top of the mind map structure, and to create presentation-style content that is associated with the mapped concepts.

VUE can also be used in conjunction with the Zotero Firefox extension to map out and visualize online documents and web clippings.

SPlayer is a free, open source media player that is lightweight, well designed, and quite powerful. It promises to play every conceivable media format (including DVD’s and streaming media), and to optimize your audio and video quality to best utilize your hardware specifications. It is light on power consumption, making it ideal for laptop/travel use, is truly portable, and offers a handful of innovative features such as on-demand automatic downloads of subtitles.

PeerBlock is an open source IP filtering application partially based on the PeerGuardian code. It is designed to prevent your computer from making undesirable connections, such as to machines flagged for anti p2p activities, corporations, governments, etc. This can significantly decrease your chances of being detected when downloading from p2p or Torrent networks, or of contracting malware/spyware from known sources. PeerBlock is available in portable form and works with all versions of Windows (including XP, Vista, Seven).

MP3 Diags is a free program that can scan your audio library for problems (including issues with invalid streams, low quality issues, incomplete tags, audio normalization, and others) and provides the ability to fix these. It includes an audio tag editor that can pull track data from MusicBrainz and Discogs, and can use MP3Gain from within the MP3Diags interface to perform audio normalization. Note, however, that this program is not geared for users looking for a 1-click fix, but rather for users with some technical background. MP3 Diags is multiplatform (Windows/Linux)

PhotoFilmStrip is a free program that can create video from images quickly and easily, including the Ken Burns style zoom-in/zoom-out effect commonly used in documentaries. Other features include the ability to add subtitles, add a soundtrack, and use black and white/sepia versions of your images. PhotoFilmStrip is multiplatform (Windows/Linux).

Viewer2 is a free image viewing and tagging app that combines form and function into a powerful program that is a joy to use. It offers an innovative tagging process based on organizing image thumbnails and folders visually and grouping them in various ways that make it very easy to work with and tag them. Includes a powerful, versatile search function that indexes metadata as well as filenames and paths.

JStock is a free, open source stock-monitoring software. It can create a database of stocks and download and deliver data and charts for these in real time for more than 20 world markets and going back up to 10 years. It can also set-up stock portfolios where it records all transactions and calculates profit or loss. Two features stand out, however, the first is Alerts delivery (SMS, Email, or in the system tray) that are based on user-created "Stock Indicators". The second is a built-in chat function designed to enable JStock users to communicate with each other and share information. JStock is multiplatform (Windows/Linux/Mac/Solaris).

DiskCryptor is a free, open source disk encryption software. It encrypts entire hard drive partitions, including the system partition as well as flash drives in real time without affecting performance. It can also create encrypted CDs/DVDs (through the use of disk image .ISO files). It offers excellent performance for mounted encrypted volumes and a good range of features and options.

FreeFileSync is a free/open source folder and file synchronization program that features a beautiful, two pane user interface and a host of powerful options. It can do the following: compare files by their content or by file size and date, synchronize files and subfolders, process multiple pairs of folders at once, load/save folder comparison sessions, create batch jobs that can be run from the command line, and can can handle cloned files (i.e. symbolic links or junctures). It also offers UniCode and Network support. There is also a portable (no-install) version.

GSplit is a freeware program that can split any file, even extremely large files, in any number of ways including by user-defined sizes or predefined sizes, by spanning across a number of removable disks/media, by number of desired pieces, or even by number of individual lines or occurrences of a pattern in the file. It can create a tiny program to re-unite the split files without needing to use the original application, and can even integrate this into the first file of your splits. Gsplit also adds a Windows explorer context menu entry for on-the-fly splits. Portable version available.

Pointy Haired Dilbert is a blog that provides some amazing, freely-downloadable MS Excel resources. The philosophy behind the site is a focus on data charting and visualization and on “telling stories” with data. Templates that can be downloaded from the site (all 100% free) include sophisticated reporting dashboards, templates for advanced charts (e.g. bullet graphs, Gannt charts, Petal Charts, Speedometer, Candlestick charts, etc.), and even Excel-based games and apps (including a calendar and an Excel-based Twitter client).

MetatOgger is a free, powerful program for tagging and renaming MP3s and other audio files. It offers the functions you would expect from a tag editor (e.g. mass renaming, tags from filenames or path, scripts to perform editing functions) as well as a few that are not so common, such as “acoustic fingerprinting” of unknown songs using the MusicBrainz database, built in album art search, importing lyrics from lyricwiki.org into your audio tags, and the ability to download a massive audio tag database that it can use as a tagging resource.