foundation-datepicker's JavaScripts & Stylesheets for Rails 3.1+ asset pipeline. Actual javascript plugin belongs to 'najlepsiwebdesigner' and could be found at appropriate GitHub repo: https://github.com/najlepsiwebdesigner/foundation-datepicker

FieldableForm allows you to easily build an end user facing form builder.

FileAPI

Rails view helpers for Filepicker.io widgets

Fine Uploader by Andrew Valums integrated for Rails 3.1+ Asset Pipeline

I like Filled 7 fonts. I like the asset pipeline. I like semantic versioning. If you do too, you're welcome.

Filter.js for Ruby on Rails

FindBug is a Sentry-like error tracking and performance monitoring gem that stores data locally using Redis and your database. Features include exception capture, performance instrumentation, alerting, and a built-in dashboard.

Makes ActiveRecord 'find_by_id, find_by_(attr)' methods and 'has_one, belongs_to' relations are cacheable by PrimaryKey(PK) or any referenced columns using Rails.cache methods. It also supports fetching multiple records using PKs(ids) with find_all_cache method(if cache store supports multiple reads [hint: memcached_store, dalli_store supports.]).

Explore your data with SQL. Easily create charts and dashboards, and share them with your team. A drop-in replacement for Blazer.

User-friendly file-uploading experience over the web

Fine Uploader by Andrew Valums integrated for Rails 3.1+ Asset Pipeline

Adds improvements to HTML syntax for id and class attributes

Fittext.js as a gem for Rails 3.1+,4

Wrapper for FitVids.js - Embedding a video resposively

Rails wrapper for fitvids, a lightweight, easy-to-use jQuery plugin for fluid width video embeds.

Fixturator is a fixture generator for ActiveRecord models

Gem for simple use flag-icon-css

A gem that adds quick configuration DSL to rails projects

Flashcam, tastefully bundled for the Rails 3.1 asset pipeline. Sweet!