100 in 100 Challenge - Get 100 new paid users in 100 days
Retweet Picker - Retweet Picker is an online tool that is helping you to select the random winner from Twitter for the giveaways.
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Retweet Pick - Retweet Pick is a random name generator for Twitter giveaways via generating a winning name from the list.
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
Twesocial - Twesocial helps you grow your twitter with real twitter followers. Real results, real people.