libvips is a demand-driven, horizontally threaded image processing library. Compared to similar libraries, libvips runs quickly and uses little memory. It has around 300 operations covering arithmetic, histograms, convolution, morphological operations, frequency filtering, colour, resampling, statistics and others. 
 
It supports a large range of numeric formats, from 8-bit int to 128-bit complex. Images can have any number of bands. It supports a good range of image formats, including JPEG, TIFF, PNG, WebP, FITS, Matlab, OpenEXR, PDF, SVG, HDR, PPM, CSV, GIF, Analyze, NIfTI, DeepZoom, and OpenSlide. It can also load images via ImageMagick or GraphicsMagick, letting it load formats like DICOM.

libvips is a demand-driven, horizontally threaded image processing library. Compared to similar libraries, libvips runs quickly and uses little memory. It has around 300 operations covering arithmetic, histograms, convolution, morphological operations, frequency filtering, colour, resampling, statistics and others. 

libvips - A fast image processing library with low memory needs

libxml++ is a C++ API for the popular libxml XML parser, written in C. libxml is famous for its high performance and compliance to standard specifications, but its C API is quite difficult even for common tasks. libxml++ presents a simple C++-like API that can achieve common tasks with less code. Unlike some other C++ parsers, it does not try to avoid the advantages of standard C++ features such as namespaces, STL containers or runtime type identification, and it does not try to conform to standard API specifications meant for Java. Therefore libxml++ requires a fairly modern C++ compiler such as g++ 3. But libxml++ was created mainly to fill the need for an API-stable C++ XML parser which could be used as a shared library dependency by C++ applications that are distributed widely in binary form. That means that installed applications will not break when new versions of libxml++ are installed on a user's computer. Gradual improvement of the libxml++ API is still possible via non-breaking API additions, and new independent versions of the API that can be installed in parallel with older versions. These are the general techniques and principles followed by the GNOME project, of which libxml++ is a part.

libxml++ is a C++ wrapper for the libxml XML parser library.

Libxml++

Libwebsockets is a lightweight pure C library built to use minimal CPU and memory resources, and provide fast throughput in both directions. It can     be configured to use OpenSSL or CyaSSL to provide fully encrypted client and server links including client certificate support.

Libwebsockets - C library for lightweight websocket clients and servers

EJDB is an embedded JSON database engine. It aims to be a fast MongoDB-like library which can be embedded into C/C++ applications. It features collection-level write locking, collection level transactions, string token matching queries, and a Node.js binding. It is the C library based on modified version of Tokyo Cabinet. JSON representation of queries and data implemented with API based on C BSON

EJDB is an embedded JSON database engine. It aims to be a fast MongoDB-like library which can be embedded into C/C++ applications. It features collection-level write locking, collection level transactions, string token matching queries, and a Node.js binding. It is the C library based on modified version of Tokyo Cabinet. JSON representation of queries and data implemented with API based on C BSON.

EJDB — Embedded JSON Database engine

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libvips - A fast image processing library with low memory needs

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EJDB — Embedded JSON Database engine

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libvips - A fast image processing library with low memory needs

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EJDB — Embedded JSON Database engine

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