Stem tools / voting tools for use during presentations

Tools i saw in use or have used for having people vote during presentations:

• PearDeck (including links to Kahoot! Quizziz, Socrative, Formative, Spiral)
• Microsoft Pulse
• "Google Q&A" (vs PearDeck)
• Plickers
• Sli.do
• Mobipres 
• ParticiPoll
• BuzzMaster (schijnt relatief prijzig te zijn)
• AskTheRoom (last time i checked, site only showed spinning wheel)