ExifTool is a platform-independent Perl library plus a command line application for reading, writing, and editing meta-information in image, audio, and video files. It supports many different types of metadata including EXIF, GPS, IPTC, XMP, JFIF, GeoTIFF, ICC Profile, Photoshop IRB, FlashPix, AFCP, and ID3, as well as the maker notes of many digital cameras.
The metric implemented in the Image::Density Perl Module estimates the density of data where there is data, and has a reasonable correlation with goodness as judged by humans. That is, if you let a human look at a set of images and judge quality, the density values for those images as calculated here tend to correlate well with the human judgement (densities that are too high or too low represent "bad'' images). It is intended for use on bitonal TIFF images, such as those from scanning paper documents.
gscan2pdf is a GUI to ease the process of producing PDFs from scanned documents. You scan in one or several pages and create a PDF of selected pages. Scanning is handled with SANE via scanimage. PDF conversion is done by PDF::API2. Perl is used for portability and ease of programming, with gtk2-perl for the GUI.
fastcgi-gallery is a Web gallery based on Apache::Gallery, but is hacked for usage with Perl FastCGI scripts. Therefore, this version is about 10x quicker (with cache turned on) than Apache::Gallery. With the best template system (Template-Toolkit) you can customize your gallery as you wish; for example, you can create a multi-language gallery. A database is not used; everything is stored in files. Output and generated thumbnails are cached for speed optimization.
Kalva is a KDE video recorder that is simple to use and easy to setup. You can use it to schedule a single movie recording by choosing the date from a calendar. A serial recording may be scheduled by choosing the days of the week. You can store recording options in various profiles for different hardware and quality levels. Kalva can import channellists from programs like xawtv or xawtv4, and can generate a new one using scantv.