dlib is a growing collection of native D language libraries useful for various higher-level projects - such as game engines, rendering pipelines and multimedia applications. It is written in D2 and has no external dependencies aside D's standard library, Phobos.
Read more here.
Currently dlib contains the following packages:
dlib.async - event loop and asynchronous programming capabilities
dlib.core - basic functionality used by other modules (manual memory management, streams, OOP for structs, etc.)
dlib.container - generic data structures (GC-free dynamic and associative arrays and more)
dlib.filesystem - abstract FS interface and its implementations for Windows and POSIX filesystems
dlib.functional - some functional programming idioms (HOFs, combiners, quantifiers, etc.)
dlib.math - linear algebra and numerical analysis (vectors, matrices, quaternions, linear system solvers etc.)
dlib.geometry - computational geometry (ray casting, primitives, intersection, etc.)
dlib.image - image processing (8 and 16 bits per channel, floating point operations, filtering, FFT, HDRI, graphics formats I/O: JPEG, PNG, BMP, TGA, HDR)
dlib.audio - sound processing (8 and 16 bits per sample, synthesizers, WAV export and import)
dlib.network - networking and web functionality
dlib.memory - allocators and memory management functions
dlib.text - text processing
dlib.serialization - data serialization (currently includes lightweight XML parser)
dlib.coding - various data compression and coding algorithms
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Copyright (c) 2011-2017 Timur Gafarov, Martin Cejp, Andrey Penechko, Vadim Lopatin, Nick Papanastasiou, Oleg Baharev, Roman Chistokhodov, Eugene Wissner. Distributed under the Boost Software License, Version 1.0 (see accompanying file COPYING or at http://www.boost.org/LICENSE_1_0.txt).