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ppminfo shows details of an ppm-file on the console. It seems this is the only utility missing from netpbm.

ppsei (PPS Extract Images) is a simple command line program, which tries to extract images from Microsoft PowerPoint documents (PPS/PPT).

Originally, PQIV was written as a drop-in replacement for QIV. The first release was not more than a Python script, hence the name. Now, PQIV is a (modulo some small extras) full featured clone of QIV written in C using GTK-2 and GLIB-2. Features include: * Command line image viewer * Directory traversing to view whole directories * Watch files and directories for changes * Natural order sorting of the images * A status bar showing information on the current image * Transparency and animation support * Moving, zooming, rotation, flipping * Slideshows * Highly customizable * Supports external image filters (e.g. convert) * Preloads the next image in the background * Fade between images * Optional PDF/eps/ps support (useful e.g. for scientific plots) * Optional video format support (e.g. for webm animations)

Preview is a very simple Image Viewer LICENSE: GPL2 or later

Precision Raster Image Convolution Engine. PRICE can open several image file formats and apply high-quality filters and other enhancements.

Prison is a barcode API currently offering a nice Qt API to produce QR code and Data Matrix barcodes, and can easily be made support more.

Jpegoptim is an utility to optimize jpeg files. Provides: * lossless optimization * lossy optimization based on setting maximum quality factor * selective strip of comments and Exif markers

NPlot is a free charting library for .NET. It boasts an elegant, flexible API and includes controls for Windows.Forms, ASP.NET and a class for creating Bitmaps.

Cartographic Projections library that performs projections to and from various cartographic coordinate systems.

projectM is an LGPL'ed reimplementation of Milkdrop under OpenGL. All projectM requires is a video card with 3D acceleration and your favorite music.