Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
Google Opinion Rewards - Answer quick surveys and earn Google Play credits with Google Opinion Rewards.
Invision - Prototyping and collaboration for design teams
Swagbucks - Swagbucks is a loyalty program that offers individuals rewards for engaging in various activities. Users can earn reward points for performing Internet searches, purchasing items from affiliated vendors, or completing polls.
Zeplin - Collaboration app for UI designers & frontend developers
Survey Junkie - Survey Junkie is an online community with over 10 million members dedicated to making your voice heard.