Comb vs EarlyParrot

Comb is an issue tracker for software teams that ensures the highest priority work is always done first

With all the different software development methodologies that have been invented, teams spend more time practicing the rituals of software development than actually coding. Comb doesn't prescribe a methodology, and focuses instead on getting out of your way so that you can get back to what actually makes the business money: working software. Comb uses user-defined rules to allocate work to team members according to the priority list, while ensuring that assigned tasks have no outstanding dependencies. Comb gets you working - fast.

EarlyParrot is a referral marketing platform that can easily be integrated into any user conversion flow to enable: existing and new customers to refer their friends in exchange for a reward

Imagine you can leverage the power of all your users, asking them to refer new users. If they succeed at getting new sign-ups, they are rewarded accordingly. A reward can be anything that users perceive value in, eg. a free month, a free ebook or even early access to certain features which are exclusive to VIP customers.