Mindstamp is an all-round tool to add interactions to a video. It especially has many fun question types that are suitable for sales and marketing. You can have someone set a date in the video for example or have your own video recorded as an answer to a question. Mindstamp has fewer publishing options than hihaho and does not work based on a timeline like hihaho, but has a list of interactions to the right of your video and markers in the playerbar to show where the interactions are.