Ant is a nice tool for writing Java build scripts, but Rake is nicer. The only thing missing from Rake is a way to run javac and jar, and although it's easy to run these as shell scripts you have to wait for the JVM to start. In combination with JRuby this gem lets you run javac and jar in your Rake scripts without exec'ing.

Audio/Video Chainer for Paperclip using FFMPEG/Avconv

Parcel is a simple library which allows normal ruby objects to maintain a series of files stored in one or more repositories which are accessible through normal ruby attributes. Possible repositories include Zip Files, Tar Files, Subversion Repos, Repos, GridFS Zips, etc. It also provides an common and easy to use interface to all these repositories (i.e. more ruby like than RubyZip), and works with ActiveRecord but doesn't depend on it.

A simple library for reading and intereacting with word processing documents, such as ODT, DOCX, etc.

Utility for parsing log files

This gem allows you to create Apple Passbook files.

This gem allows you to create IOS Passbooks. Unlike some, this works with Rails but does not require it.

iOS Passbook Passes

Generate Apple Passbook passes in Ruby

Generate Apple Passbook passes in Ruby

Apple Wallet passes require signing. Apple provides code for this, it isnt ideal.

With peerflixrb you can search for movies and TV shows and stream them directly on your favorite video player! You can choose the torrent and the subtitles file or you can let it choose the best for you.

Easy installation and use of Phantomjs.

Picolena is a lightweight ferret-powered documents search engine written in Ruby on rails

(P)ick (i)mages and (g)enerate (g)alleries

Pimki in a Personal Information Manager based on Instiki's Wiki technology. Besides all the rich features and excellent look of Instiki, a few features have been added, such as: a personal blog, todo lists, graphical mapping, quick-links, advanced search and others.

Pinpoint a users location by their IP address.

PIONE(Process-rule for Input/Output Negotiation Enviromenment) is a rule-based workflow engine.

Ruby tool to automatically download x264 HD nzb movies files from newzleech.com & nzbs.org

Ruby tool to automatically download subtitles (srt) inside your TV Shows folder