Dateutils are a bunch of tools that revolve around fiddling with dates and times in the command line, with a strong focus on use cases that arise when dealing with large amounts of financial data. Their target market is shell scripts that need date calculations or calendar conversions, and as such they are highly pipe-able and modeled after their well-known cousins (e.g. dtest vs. test, or dgrep vs. grep).
s6-dns is a small, efficient, complete, and IPv6-ready DNS client library, with synchronous as well as asynchronous APIs. It is designed to replace libresolv in projects that need to perform DNS resolution. It also comes with small command-line utilities to make common and not so common DNS queries.
Libpsl is a C library which provides functions to check domains against the Mozilla Public Suffix List. It is useful for cookie domain verification, certificate domain verification, highlighting parts of a domain name, and more. Every Web client handling cookies (e.g. browsers) should use the PSL data to secure privacy.
ext-Dns is a core library, an extensible forward DNS server, and some additional tools designed to create DNS server solutions which are able to do any additional operation at the resolution level (running commands, rewritting replies, gathering stats, and so on), without any limit. It provides a ready-to-use solution in case you want to build a DNS server which takes additional actions at the resolution level in an easy way. That is, its design is focused on allowing people to implement whatever they like when a request is received, freeing them from most of the details which involves handling DNS protocol.
STALLioN is a cross-platform C/C++ library for creating coherent CLI/Terminal programs on multiple platforms with one codebase. It aims to provide a consistent development API across multiple platforms so that separate code does not have to be created for each (often very different) terminal interface.
fpgatools is a toolchain for programming flexible programmable gate arrays (FPGAs). The only supported chip at this time is the xc6slx9, a cheap (circa $10 U.S.) but powerful 45nm-generation chip with about 2400 LUTs, block ram, and multiply-accumulate devices. The principles of fpgatools are to reach the maximum physical performance of the chip, to provide fast development cycles, to be an independent toolchain which only depends on other Free Software, and to be a lightweight C implementation without a GUI.
Wslay is a WebSocket library written in C. It implements the protocol version 13 described in RFC 6455. This library offers 2 levels of API: an event-based API and a frame-based low-level API. For the event-based API, it is suitable for non-blocking reactor pattern style. You can set callbacks in various events. For the frame-based API, you can send WebSocket frame directly. Wslay only supports the data transfer part of the WebSocket protocol and does not perform the opening handshake in HTTP. It does not perform any I/O operations for its own. Instead, it offers callbacks for them. This makes Wslay independent of any I/O frameworks, SSL, sockets, etc. It is portable across various platforms, and the application authors can choose I/O frameworks freely.