Caligari is designed to allow the quick and easy installation of configuration files by symbolically linking files from external sources directly to the user's home directory.

Migrations for Cassandra in CQL and Erb.

Execute remote commands via ssh on groups of machines

Resque can be very useful outside of a web app, too. What if you want to write jobs in Ruby and just enqueue them from your console? Or from a Java application? Or in cron jobs? Cavalcade to the resque! Cavalcade creates a resque-based, stand-alone job queue, and provides rake tasks to enqueue all of your jobs.

Nagios plugin to check cepmon rules

Oscillating Markov text generator

Search a Chef server via CLI or API given a role, name, or Chef environment

Use with Chef-Solo. Grabs node info as array of Hashes or String ips.

a library and commandline tool to pick causative mutation from bulks segregant sequencing

System health tool for everyone

CICADA (Colocalization and In-situ Correction of Aberration for Distance Analysis) implementation; see Fuller and Straight J. Microscopy (2012) doi:10.1111/j.1365-2818.2012.03654.x

Simple tool to manage various configuration files in repository

Hiera backend for decrypting encrypted yaml properties (Fix for Issue #62)

A utility for sorting messy folders

Cliff is a CLI client written in ruby for friendpaste.com

Library, not a framework, for building command line interfaces to your ruby application

Closh automatically bootstrap servers in the cloud to run shell commands

You can't encrypt a file bigger than the private key. You first have to generate a random key and a random vector initialization to encrypt the file using a symmetrical algorithom. Later you use the private key to encrypt the random key and the random vector

CloudFormula is a tool which generates and uploads CloudFormation templates from ERB templates.

A simple gem for uploading a RightScale RightImage (with a fingerprint) to CloudStack.