log4ever is simple logger for evernote. It is available as an extension of log4r.

A command line interface for logaling.

Preprocess step of web mining

Logging for ascent

Scatter "log!" calls in your Rails app to make debugging and timing easy

Useful for archiving old logs

Broadcasts logs, including support for Rails version 4.2.

Parses log files and imports them into a database

Extensions to ActiveRecord to log entries on model changes

Add a custom logger and formatter to rails logs

Enhance Ruby logger with support for key-value metadata.

Generate logstash compatible log output from Rails apps.

Searches remote log files via API

Wraps logging in a nice and convenient way making it easy to apply on any project

Loggly Ruby Client Library

Adapters for different ruby logging backends. Create loggers using different adapters, like Logger (Stdlib), Rails or SLF4J (in JRuby only).

login attack report in Rails.

Easily login with Google in your app

Client gem for reporting errors and custom metrics from Ruby and Rails apps to logister.org

Alternative set of LogSubscriber classes for Rails for more structured JSON logs