Really Good Emails - A large collection of good product email design.
VerifyShare - instagram, instagram tools, giveaway, parsing,
Good Sales Emails - Best sales emails from great companies
Giv - Snapchat & Instagram giveaways made easy
Great Email Copy - A dose of emails from around the web.
Retweet Picker - Retweet Picker is an online tool that is helping you to select the random winner from Twitter for the giveaways.