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ZooKeeper is a distributed, open-source coordination service for distributed applications. It exposes a simple set of primitives that distributed applications can build upon to implement higher level services for synchronization, configuration maintenance, and groups and naming. It is designed to be easy to program to, and uses a data model styled after the familiar directory tree structure of file systems. It runs in Java and has bindings for both Java and C. Coordination services are notoriously hard to get right. They are especially prone to errors such as race conditions and deadlock. The motivation behind ZooKeeper is to relieve distributed applications the responsibility of implementing coordination services from scratch.

zpu Typical usage seems to be experienced engineers who have some very particular requirements that can only be met using the ZPU due to technical or licensing issues. Academic circles have found the ZPU appealing since the actual core is trivial and allows them to focus on some other aspect of research or student exercises.

zpu-gcc compiler suite for the zpu Typical usage seems to be experienced engineers who have some very particular requirements that can only be met using the ZPU due to technical or licensing issues. Academic circles have found the ZPU appealing since the actual core is trivial and allows them to focus on some other aspect of research or student exercises.

ZTCL is an extension library for TCL written in the C language. It implements an interface to the ZLIB compression and decompression library, the one used by GZIP.

Paraphrasing the website: The ZThread package is an advanced object-oriented, cross-platform, C++ threading and synchronization library. It provides a high level abstraction of the native threading mechanisms to offer a great deal of flexibility and control. ZThread features interruptible Thread and Runnable objects for C++, control objects and implementations of concurrency design patterns. This includes semaphores, mutexes, condition variables as well as other more complex components. ZThread implementations are provided for POSIX and Win32 platforms.

The zzip library provides read access to zipped file in a zip-archive. It is based solely on free algorithms provided by zlib and can transparently access files being either real files or zipped files with the same file path argument.

zc.buildout provides support for creating applications, especially Python applications. It provides tools for assembling applications from multiple parts, Python or otherwise. An application may actually contain multiple programs, processes, and configuration settings.

pythk is a collection of functions for Python. It is used by sqlcc.

Use rbenv to pick a Ruby version for your application and guarantee that your development environment matches production. Put rbenv to work with Bundler for painless Ruby upgrades and bulletproof deployments.

rebar is an Erlang build tool that makes it easy to compile and test Erlang applications, port drivers and releases. rebar is a self-contained Erlang script, so it's easy to distribute or even embed directly in a project. Where possible, rebar uses standard Erlang/OTP conventions for project structures, thus minimizing the amount of build configuration work. rebar also provides dependency management, enabling application writers to easily re-use common libraries from a variety of locations (git, hg, etc).