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[991 users on Ohloh]
rsync is an open source utility that provides fast incremental file transfer.
GNU netcat
[203 users on Ohloh]
Netcat is a featured networking utility which reads and writes data across network connections, using the TCP/IP protocol.

It is designed to be a reliable "back-end" tool that can be used directly or easily driven by other programs and scripts. At the same time, it is a feature-rich network debugging and exploration tool, since it can create almost any kind of connection you would need and has several interesting built-in capabilities.

[66 users on Ohloh]
ArgoUML is the leading open source UML modeling tool and includes support for all standard UML 1.4 diagrams. It runs on any Java platform and is available in ten languages.

ArgoUML was installed half a million times during 2005 and is in use all over the world.

[63 users on Ohloh]
FirePHP enables you to log to your Firebug Console using a simple PHP method call.

All data is sent via a set of X-FirePHP-Data response headers. This means that the debugging data will not interfere with the content on your page. Thus FirePHP is ideally suited for AJAX development where clean JSON or XML responses are required.

[59 users on Ohloh]
File tests each argument in an attempt to classify it. There are three sets of tests, performed in this order: filesystem tests, magic number tests, and language tests. The first test that succeeds causes the file type to be printed.
Starting with version 4, the file command is not much more than a wrapper around the "magic" library.
[48 users on Ohloh]
Poedit is cross-platform gettext catalogs (PO files) editor which runs on Unix, Windows and Mac OS X. Unlike other editors, Poedit provides compact view of data and very effective UI.
[47 users on Ohloh]
Puppet lets you centrally manage every important aspect of your system using a cross-platform specification language that manages all the separate elements normally aggregated in different files, like users, cron jobs, and hosts, along with obviously discrete elements like packages, services, and files.

Puppet's simple declarative specification language provides powerful classing abilities for drawing out the similarities between hosts while allowing them to be as specific as necessary, an...

[19 users on Ohloh]
Facter is a cross-platform library for retrieving simple operating system facts, like operating system, linux distribution, or MAC address.
[12 users on Ohloh]
Plagger is a pluggable RSS/Atom feed aggregator and mashup creating software, written in pure Perl.
[12 users on Ohloh]
Bcfg2 helps system administrators produce a consistent, reproducible, and verifiable description of their environment, and offers visualization and reporting tools to aid in day-to-day administrative tasks.
[11 users on Ohloh]
FlameRobin is an administration and management GUI tool for the Firebird DBMS written in C++ using wxWidgets and IBPP libraries.

The goal of the project is to build a lightweight, cross-platform application which doesn't have any closed-source dependency for either building or running.

[11 users on Ohloh]
Hundreds of functions of a variety of topics, from statistics to string parsing, module utilities to network tools.

Everyone's pet library accumulates features over time. My erlang library got big, fast. I often find myself giving functions from it out to other people, and a lot of my other libraries are dependant on ScUtil in various ways, so I figured what the hell, let's give it away.

This library is believed to be efficiently implemented at all points. Efficiency tips are, howeve...

RapidMiner (YALE): Java Data Mining
[10 users on Ohloh]
RapidMiner (formerly YALE) is the most comprehensive open-source software for intelligent data analysis, data mining, knowledge discovery, machine learning, predictive analytics, forecasting, and analytics in business intelligence (BI). RapidMiner provides more than 400 data mining operators, a graphical user interface (GUI), an online tutorial with hands-on data mining applications, a comprehensive PDF tutorial, many visualization schemes for data sets and data mining results, many different le...
[9 users on Ohloh]
JSON-lib is a java library for transforming beans, maps, collections, java arrays and XML to JSON and back again to beans and DynaBeans. It is based on the work by Douglas Crockford in http://www.json.org/java. Includes support for Groovy and JRuby as well.
[9 users on Ohloh]
To put it simply, Krumo is a replacement for print_r(); and var_dump();. By definition Krumo is a debugging tool (PHP4/PHP5), which displays structured information about any PHP variable.

A lot of developers use print_r() and var_dump() in the means of debugging tools. Although they were intended to present human readable information about a variable, we can all agree that in general they are not. Krumo is an alternative: it does the same job, but it presents the information beautified usi...

[9 users on Ohloh]
WebLOAD is an open source tool for load testing, stress testing and performance testing that is sponsored by RadView. It can load-test any Internet application, including applications that use Web 2.0 & AJAX.

This project is based on twelve years of code development invested in the previously proprietary WebLOAD, the award winning commercial performance testing solution for internet applications from Radview Software . WebLOAD is a great starting point for this project, with a communit...

[7 users on Ohloh]
iftop does for network usage what top(1) does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts. Handy for answering the question "why is our ADSL link so slow?".
Maven Dependency Overview
[6 users on Ohloh]
Maven plugin that creates a diagram of all dependencies The entire transitive closure.
Work as part of Maven report as well as standalone.
Gnome Planner
[5 users on Ohloh]
Tags: project-management tool
Planner is a project management tool. It was originally created by Richard Hult and Mikael Hallendal at Imendio and now managed by Gnome.
GNU ed
[4 users on Ohloh]
Tags: tool c++ editor shell
The standard GNU text editor.