We have a few tools you can use to make your life easier.
Bot checklist
We have created a checklist for every bot launched using our platform. The checklist will give you some extra tips around how best to design these things.
Popplet

We recommend using Popplet to design your conversational flow
Inklewriter

If you are looking at creating yourself a choose your own adventure style bot, then we recommend inklewriter.
http://www.inklestudios.com/inklewriter/
Tone Analyzer

Paste text from your bot into this tool to analyze the tone of voice.