I'll add another recommendation:
TextureWriter
- Pros:
- Free web-based tool for choice-ish games
- Interesting interaction mechanism - you drag 'verb' words onto target words/phrases in the main text to choose an action
- lots of room for literary play in how you decide what the 'verbs' are
- visual UI for creating, no need for direct text coding
- Projects can be hosted on their site for public play, or downloaded as web code
- Cons:
- Solely text-based; I don't think you can add images?
- Unusual interaction mechanism may not be your thing