AppLogger is a library that allows an application programmer to provide run-time customizable output from an application. It includes a function, applogger_log(), with calling semantics analogous to the standard C library's printf(), but with extra arguments to specify a classification for the output message. Calls to applogger_log() thus specify the classification and text of a message; calls to other functions in the AppLogger library determine the real-time policy applogger_log() applies to messages of a given classification: print to file, send over a network socket, ignore the message, etc. In short, AppLogger allows for the separation of message content and message output policy in an application.
Brace is a dialect of C that looks like Python. It has coroutines, hygenic macros, header generation, and libraries with graphics and sound. It is meant to be good for beginners, kids, and experts. Brace is translated to C, then compiled, with #! support and cached executables. It is fairly portable, and runs on GNU/Linux, Unix, and Windows with MinGW. It should also run on Mac OS X. It comes with a lot of demo programs, many with animated graphics.
Schedule::Cron is a Perl module that provides a simple but complete cron-like scheduler. It can be used for periodically executing Perl subroutines. The philosophy behind Schedule::Cron is to call subroutines periodically from within one single Perl program instead of letting cron trigger several (possibly different) Perl scripts. Everything under one roof. Furthermore, Schedule::Cron provides a mechanism to create crontab entries dynamically, which isn't that easy with cron. It knows about all extensions (at least all extensions the author is aware of, i.e those of "Vixie" cron) for crontab entries like ranges including 'steps', specification of month and days of the week by name, or coexistence of lists and ranges in the same field. It even supports a bit more (like lists and ranges with symbolic names). It has existed since 1999 on CPAN and is successfully used in many projects.
PD4ML is a powerful PDF generating library that uses HTML and CSS for page layout and content definition. It allows developers to easily add PDF generation functionality to software written for the Java and .NET platforms. PD4ML is easy to deploy and does not rely on any native components. It is based on a proprietary HTML rendering engine, optimized for PDF layout generation. The rendering engine implements most standard features of HTML4/CSS2 and a number of custom PDF-generation-specific functions for pagination control, header/footer generation, watermarking, TOC generation, margin control, etc. PD4ML allows you to easily embed word processor documents, spreadsheets, and rich media content as attachments to the resulting PDF documents.
Jmx4Perl provides an alternate way of accessing Java JEE Server management interfaces that are based on JMX (Java Management Extensions). It is an agent-based approach where a small Web application deployed on the application server provides HTTP/JSON-based access to JMX MBeans registered within the application server. It is set up from a handful of Perl modules, which can be integrated seamlessly in your own programs. It also includes a Nagios plugin, check_jmx4perl, a jmx4perl command line tool for remote JMX queries and operations, and a readline-based JMX shell j4psh, with context sensitive command completion and syntax highlighting.
YAJL (Yet Another JSON Library) is a small event-driven (SAX-style) JSON parser written in ANSI C, and a small validating JSON generator. It's highly portable, data representation independent, fast, generates verbose error messages including context of where the error occurs in the input text, can parse JSON data incrementally off a stream, and is tiny.
LibUtillery is a free, BSD-licensed programmer's toolbox; a lightweight and thoroughly documented collection of sub-libraries that solve generic and often repetitive tasks. It also helps with writing portable software by providing a single API to many non-standard extensions that are not natively supported on all operating systems. It ships functions for memory management and debugging, logging, thread synchronization, and debugging, configuration file parsing, hash table, tree and list data structures, standard integer types, and more.