Free lossless software for linux

LZO is a data compression library which is suitable for data de-/compression in real-time. This means it favours speed over compression ratio.
LZO is written in ANSI C. Both the source code and the compressed data format are designed to be portable across platforms.
Main features:
- Decompression is simple and *very* fast.
- Requires no memory for decompression.
- Compression is pretty fast.
- Requires 64 kB of memory for compression.
- Allows you to dial up extra compression at a speed cost in the compressor. The speed of the decompressor is not reduced.
- Includes compression levels for generating pre-compressed data which achieve a quite competitive compression ratio.
- There is also a compression level which needs only 8 kB for compression.
- Algorithm is thread safe.
- Algorithm is lossless.
Enhancements:
- Changed the configure system to install the LZO library under the name "liblzo2" so that parallel installation with LZO v1 is possible.
- Improved auto-configuration in miniLZO for some embedded targets like Blackfin and H8/300 processors.

libjpeg is a library for handling the JPEG (JFIF) image format. Included are the programs cjpeg and djpeg for converting to and from this format, jpegtran to perform some lossless transformations on JPEG imagess, and rdjpgcom and wrjpgcom to manipulate JFIF comments.

My Photo Gallery is a Web-based photo gallery that also supports non-image filetypes. It is easy to setup and even easier to maintain.
Slick-looking image galleries and thumbnails are generated on the fly from any root directory that you specify. Albums can be created using the included Web-based adiminstration tool or by creating a directory and copying your pictures and files to that directory.
A Web administration interface is available to help add descriptions, rename images, rotate images (losslessly), and more. It includes advanced features such as image logging, renaming, resizing, image rotation, smilies, and visitor comments.
Unlimited filetypes may be recognized, and custom images for them can be displayed in your galleries, allowing you to archive MP3s, MPEGs, AVIs, etc.
Main features:
- Automatic creation of photo,movie, and file galleries
- Web based upload and gallery manager
- Automatic unziping of uploaded .zip files (requires unzip to be installed and in your path)
- Uses a template.html file to quickly make everything match your current site
- Simply ftp your stuff or use the web based manager
- Pretty file name option (in config file)
- Automatic thumbnail generation
- Automatic creation of various sizes of each image so that your visitors can specify the viewing size of their preference.
- Logging for each time a picture or album is viewed.
- Visitors can comment on each picture.
- Shutterfly.com support to allow your visitors to order prints.
- Manage your photo galleries from the web.
- Previous/next picture buttons with thumbnail preview
- Automatic extraction of EXIF data embedded from most digital cameras
- Easyily themable with your custom colors, logo, and main page
- Configurable filetype support to support any filetype for download
- Upload, rotate (lossless), rename, or delete images using the web manager interface
- password protect directories using a lock file of user/passs
- replace (and about every other derivation) with a picture of a smiley
- I am sure there is more that I cannot think of.

XML Copy Editor is an XML editor with DTD/XML Schema/RELAX NG validation, XSLT, XPath, pretty-printing, syntax highlighting, folding, tag completion/locking and lossless import/export of Microsoft Word documents.
Enhancements:
- This release fixes a number of bugs and introduces support for CSS.

shn2make works with sets of shn or flac audio files and the make program to automate the process of burning shn archive CD-Rs, audio CD-Rs and the encoding of lossy mp3 and ogg-vorbis files.
shn and flac are lossless audio compression formats. shn and flac are commonly used for distribution of high-quality live recordings of "trade friendly" bands. You will find many via etree.org , or in USENET groups like alt.binaries.gdead.
shn and flac file sets are typically distributed with a .nfo or .txt file which contains the set list and other information.
Shn2make finds all the shn or flac files in the current directory and checks thier md5 checksums. Then shn2make looks for the .nfo or .txt file, and trys to figure out the song names and corresponding disc and track numbers. The song names are matched against available shn/flac files. Finally, if all the files check ok and everything is complete and makes sense a Makefile is created.
Using this Makefile with the standard "make" utility, various tedious sequences of tasks can be automatically performed on the set of shn or flac files. For example archiving the set to CD, or encoding all the songs to mp3 with the correct names.
Enhancements:
- When wodim is available, it is used instead of cdrecord.

Baudline is a real-time signal analysis tool and an offline time-frequency browser. Baudline project has a built-in tone generation capability and it can play back audio files with a multitude of effects and filters.
Designed for environmental analysis missions that range from modulation parameter measurements to searching for transient signals that go bump in the night, baudline combines fast digital signal processing, versatile high-speed displays, and continuous capture tools for hunting down and studying elusive signal characteristics.
Main features:
- 192 kHz real-time bandwidth
- 96 dB dynamic range
- Real or Quadrature input
- Multiple sound card support
- Input Digital Down Converter (tuner)
- Configurable input channels that can perform various operations
- Channel Equalization
- Frequency, time, amplitude, and sample probability distribution analysis
- Drift Integration "de-chirping"
- High speed displays
- Test signal generation
Audio player
- looping
- speed control with multirate resampling
- pitch scaling
- heterodyning (frequency shifting)
- 2D matrix surround panning
- notch, high, and low pass filters
- digital gain boost
File loading
- file formats: .wav, .aiff, .au, .al, .snd, .voc, .rmd, .pvf, .mp3, ID3, .ogg, .gsm, .sah, .fna, raw, .avi, .mov
- channels: mono, stereo, ... up to 9 channels
- data formats: ASCII decimal, A-law, u-law, 1-bit (msb & lsb), 8-bit (signed & unsigned), 16/24/32-bit integer (little & big endian), float, double
- compression
- lossless suffixes: .gz, .bz2, .Z, .zip, .flac
- codecs: ADPCM, GSM, MPEG, Ogg Vorbis
Measurements
- peaks: primary, secondary, delta (Hz dB PSD)
- fundamental: (Hz dB PSD), auto drift rate, chromatic, periodicity, RPM
- distortion: SNR, THD, SINAD, ENOB, SFDR
- power: full, select, noise ratio (dB PSD)
- system: clips, delta selected, frequency range, cursor time, UTC time

imgSeek project is a photo collection manager and viewer with content-based search and many other features.
The query is expressed either as a rough sketch painted by the user or as another image you supply (or an image in your collection).
The searching algorithm makes use of multiresolution wavelet decomposition of the query and database images.
Main features:
- You simply draw a rough sketch of what you want to find and imgSeek displays for you a thumbnail view of the best matches.
- Query images similar to one in your collection by double-clicking on its thumbnail.
- Group your photos by similarity for easy browsing. You may also have them clustered automatically by color, date (group events automatically using an adaptive clustering algorithm for time differences), filename or image features.
- Edit metadata (description, camera, lens, etc) for every image, and use them on the HTML albums generated or for searching photos. You can also use custom metadata fields.
- EXIF and IPTC data found on JPEG/TIFF files are automatically imported. (Read-only support)
- Advanced command-line utility to scan for new files, query for similar images and show image metadata. (You may use it on your cron system for example)
- Transform images or batches automatically: Place text captions, change brightness, contrast, blur, etc. Apply lossless rotations automatically if jpegtran is available.
- Generate HTML albums for the entire collection, a given directory or similarity group
- Advanced keyword searching for metadata.
- Find all duplicate images on your collection with the parameters you specify. (dimensions, filesize, filename, similarity, average luminance)
- Organize and browse pictures in groups with an easy drag & drop interface. You can also perform advanced queries on groups (eg.: show me all images that belong to group A and B but not group C)
- Support for multiple volumes of pictures. You may assign all images on a CD to a given Volume
- Automatic thumbnail generation and caching. Using this standard, which is also used by Gimp, Nautilus/Gnome, Rox Desktop, gThumb and others.
- Remember the way images should be displayed: If you rotate an image 270 degrees, imgSeek will remember it and do the same the next time you view this image.
- Export/Import metadata to/from CSV files and export a batch or your collection to XML files, which can be later parsed by some other tool to generate whatever you want.
- Rename a file or batch of files automatically: Replace strings, convert to upper/lowercase, append a string, create numbered series, etc.
- Add images to the database from a directory recursively.
- User friendly interface that remembers typed queries and drawn sketches for later usage.
- Slideshow for a given directory, whole collection or for a chosen group of similar images. You can also delete and organize images in groups with * hotkeys.
- Browse images by thumbnail and view them on a preview window.
- Browse your system files for images, and bookmark your favorite directories. While browsing, you may query for similar images on your collection.
Enhancements:
- Major speed enhancements and small bugfixes were done.