DonatePal - The new way to donate to charities
Simple Poll - The easiest way to create polls in Slack
All or Nothing - Competitive donations for causes you care about.
GitHub Polls - Polls for GitHub issues and readme
Engage - Engage is a PowerPoint add-in that lets people of any skill level create and automate visually impressive presentations with infographics, pictograms and data maps.
Curious Polls - Answer a question once a day for the chance to win £100/$100