jpegoptim is a utility to optimize jpeg files. Both lossless and lossy optimization are available from this free and open source tool.
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oxipng – multithreaded PNG optimizer
Oxipng is a multithreaded lossless PNG compression optimizer (CLI and library).
Read morepngcrush – optimizer for PNG files
Pngcrush is a free and open source optimizer for PNG (Portable Network Graphics) files. It is a command-line tool.
Read morezopflipng – PNG optimisation tool using zopfli
Zopfli Compression Algorithm is a compression library programmed in C to perform very good, but slow, deflate or zlib compression.
Read moreOptiPNG – advanced PNG optimizer
OptiPNG optimizes PNG files, i.e. reduce their size to a minimum, without losing semantic information.
Read morepngquant – command-line utility and a library for lossy compression of PNG images
pngquant is a command-line utility and a library for lossy compression of PNG images.
Read moreLepton – image compression tool and file format
Lepton is a tool and file format for losslessly compressing JPEGs by an average of 22%.
Read moreMozJPEG – Mozilla JPEG Encoder Project
MozJPEG improves JPEG compression efficiency achieving higher visual quality and smaller file sizes at the same time.
Read moreGuetzli – perceptual JPEG encoder
Guetzli is a JPEG encoder that aims for excellent compression density at high visual quality.
Read moreGottenGeography – photo geotagging application
GottenGeography is a geotagging application written for the GNOME desktop. It’s written in Python.
Read moreGPS Correlate – correlates digital images with GPS data filling EXIF fields
GPS Correlate matches GPS data with digital camera photos. This is free and open source software written in C.
Read moreKGeoTag – geotagging program
KGeoTag is a standalone geotagging program. It’s free and open source software written in the C++ programming language.
Read moreGeotag – match date/time information from photos
Geotag is software to match date/time information from photos with location information from a GPS unit or from a map.
Read moreGpsPrune – view, edit, and convert coordinate data from GPS systems
GpsPrune is a map-based application for viewing, editing and converting coordinate data from GPS systems.
Read moreImageMagick – create, edit, compose, or convert bitmap images
ImageMagick is a software suite to create, edit, and compose bitmap images. All manipulations can be achieved through shell commands.
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