If PDF is electronic paper, then pdftk is an electronic staple-remover, hole-punch, binder, secret-decoder-ring, and X-Ray-glasses. Pdftk is a simple tool for doing everyday things with PDF documents.

SVG-edit is a fast, web-based, Javascript-driven SVG editor that works in any modern browser:

The OpenStack Open Source Cloud Mission: to produce the ubiquitous Open Source Cloud Computing platform that will meet the needs of public and private clouds regardless of size, by being simple to implement and massively scalable

Open Advice is a knowledge collection from a wide variety of Free Software projects. It answers the question what 42 prominent contributors would have liked to know when they started so you can get a head-start no matter how and where you contribute.

The site will serve to surface existing projects, provide a forum for discussing projects and processes, and guide internal and external groups in open development, release, and contribution.

openBarter is a database schema defining primitives of a barter market. It is also an extension of the postgreSQL database.

It is an attempt to invent an alternative to the financial system supervising human economy, since archaic barter has always been the result of a crumbling financial system. openBarter that allow multilateral exchanges should be nearly as liquid as a regular market using money.

Titan Files is a filesystem abstraction for App Engine apps, providing a file-like API which uses the App Engine datastore and blobstore underneath.

Genius is a general purpose calculator program similar in some aspects to BC, Matlab, Maple or Mathematica. It is useful both as a simple calculator and as a research or educational tool. The syntax is very intuitive and is designed to mimic how mathematics is usually written. GEL is the name of its extension language, it stands for Genius Extension Language, clever isn't it? In fact, many of the standard genius functions are written in GEL itself.

Bacula is a set of Open Source, enterprise ready, computer programs that permit you (or the system administrator) to manage backup, recovery, and verification of computer data across a network of computers of different kinds. Bacula is relatively easy to use and efficient, while offering many advanced storage management features that make it easy to find and recover lost or damaged files. In technical terms, it is an Open Source, enterprise ready, network based backup program.

Welcome to the Open Hardware Repository, a place on the web for electronics designers to collaborate on open hardware designs, much in the philosophy of the free software movement.

home of the Global Village Construction Set, developing community-based solutions for re-inventing local production.

Ohloh is a free public directory of open source software and people.

Ohloh is a wiki, and anyone is welcome to join our community and add new projects to our directory, or to make corrections to existing directory pages. This public review makes Ohloh one of the largest, most accurate, and up-to-date software directories available.

Ohloh is not a forge -- we do not host open source projects in the traditional sense. Ohloh is a directory, a community, and an analytics service. We use the data from our directory to create historical reports about the changing demographics of the open source world.

Gearman provides a generic application framework to farm out work to other machines or processes that are better suited to do the work. It allows you to do work in parallel, to load balance processing, and to call functions between languages. It can be used in a variety of applications, from high-availability web sites to the transport of database replication events.

Are you dissatisfied with the usability, performance, lack of type-safety, and lack of / difficulty with extensibility of the printf()-family, Boost.Format and the IOStreams?

Do you value speed, robustness and internationalisation support?

If the answer to these questions is yes, meet FastFormat, the best C++ output/formatting library you'll ever use.

The OS (OpenStructures) project explores the possibility of a modular construction model where everyone designs for everyone on the basis of one shared geometrical grid. It initiates a kind of collaborative Meccano to which everybody can contribute parts, components and structures.

Static publishing

AppScale is an open-source implementation of the Google AppEngine (GAE) cloud computing interface from the RACELab at UC Santa Barbara. AppScale enables execution of GAE applications on virtualized cluster systems. In particular, AppScale enables users to execute GAE applications using their own clusters with greater scalability and reliability than the GAE SDK provides. Moreover, AppScale executes automatically and transparently over cloud infrastructures such as the Amazon Web Services (AWS) Elastic Compute Cloud (EC2) and Eucalyptus, the open-source implementation of the AWS interfaces.

Contains a useful list of blog platforms

The Lively Kernel is a web programming environment. It was developed at Sun Microsystems Laboratories and is now available as MIT licensed open source software to encourage further exploration by academics and adventurous developers.

FreeImage is an Open Source library project for developers who would like to support popular graphics image formats like PNG, BMP, JPEG, TIFF and others as needed by today's multimedia applications. FreeImage is easy to use, fast, multithreading safe, compatible with all 32-bit versions of Windows, and cross-platform (works both with Linux and Mac OS X).

Instead of inventing new APIs and complex wire protocols, 0MQ extends the socket API, eliminating the learning curve and allowing a network programmer to master it in a couple of hours. The wire protocols are simplistic, even trivial. Performance matches and often exceeds that of raw sockets.

Programming environment for scripting that has a visual system that recognizes gui elements.

Openframeworks is a c++ library designed to assist the creative process by providing a simple and intuitive framework for experimentation.

C++ multiplatform framework

Lua projects

Inexpensive computers for learning

The Fink Team wants to bring the full world of Unix Open Source software to Darwin and Mac OS X. We modify Unix software so that it compiles and runs on Mac OS X and make it available for download as a coherent distribution