Kangal brings you a nice set of custom validators for Rails 4.

Ticketing systems (Github, Jira, etc.) are strongly integrated into our processes and everyone understands their necessity. As soon as a developer becomes a lead/technical manager, he or she faces a set of routine tasks that are related to ticketing work. On large projects this becomes a problem, more and more you spend time running around on dashboards and tickets, looking for incorrect deviations in tickets and performing routine tasks instead of solving technical problems.

Daily standup automation for easier collaboration

MailCatcher REST API SDK

MailGate is an additional delivery method for the Mail gem that lets you restrict the delivery of mail to only whitelisted emails.

Adds SendGrid X-SMTPAPI header support to Mail

Messenger: easy message sending for various protocols.

Easily switch between email APIs

a workflow scheduler enabling fine-grained dependency management

Pig Media Server

Checks puppet manifests for security related problems.

Deliver mail in a resque job

A unified interface for various messaging queues

Rumbster is a simple SMTP server that receives email sent from a SMTP client. Received emails are published to observers that have registered with Rumbster. There are currently two observers; FileMailObserver and MailMessageObserver.

RUby Simple Exception Notification (a.k.a. rusen) as it names indicates is a simple exception notification for ruby.

Safely run your code in a loving error reporting embrace

Sensu sms plugins

SimplePostmark makes it easy to send mails via Postmark using Rails's ActionMailer.

SimplePostmark makes it easy to send mails via Postmark™ using Rails 3's ActionMailer.

Send mail with handlebars like templates