One question I often get asked about is what are some tools to create mockups, wireframes. Luckily smashinghub has currated a list of 20 Best UX Design and Wireframing Tools for Mobile . Out of the 20, my favorites are:
Another wireframing tool I like that's not listed is LucidChart
You can see the full list of 20 Best UX Design and Wireframing Tools for Mobile here.
What is your favorite Design and Wireframing Tool?