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!

Flashcam, tastefully bundled for the Rails 3.1 asset pipeline. Sweet! (forked from ruliana/flashcam-rails, which in turn was forked from zigotto/flashcam-rails)

flashlight displays your rails flash messages. Works with old flashion page loads and AJAX.

flashy provides helper methods to render flash messages in Rails views. Besides, it provides a javascript library to create flash messages in the browser

simple liberary to include flat-ui into rails apps

Integrate flatui based on bootstrap3 with rails

Asset pipeline gem for the Jquery Mobile Flat UI gem.

flat-ui for rails