Twitter Polls - Polls embedded in tweets
Three Cents - Quickly create polls and gather opinions from anyone
Simple Poll - The easiest way to create polls in Slack
Anonypoll - Anonymous polls platform to seek and share honest opinions
Curious Polls - Answer a question once a day for the chance to win £100/$100
ViceVersa - ViceVersa does File Synchronization, File Replication, File Backup and File Comparison.