Instapage lets non-coders making landing pages.
I've used Instapage for clients who were about to launch a business and wanted to grow their email list ahead of time. They work really well with Mailchimp as an email client to send the emails to, and Instapage gives you good options with customization.
I've also used Instapage for sweepstakes where people enter some information about themselves to enter. It's a really great way to get a page up, fast, and start getting interest in your product/website.
Also, I've heard people use it to see if people would be interested in an idea. They target a Facebook/Instagram ad to a potential audience, set up an Instapage landing page, and see how many hits or inbounds they get. It's a super scrappy way to get started.
You get 30 days free and then you have to start paying. It's not that expensive, but there isn't a free "forever" tier.
ShotSnapp or Shot Snapp (I'm not exactly sure how they prefer to be spelled) makes it super easy to make mock ups for marketing pages, presentations, or to share around.
It's insanely easy to use. Select the type of shell (phone or browser window) and then drop in your image. You're literally done at this point, but you could customize colors, size of image, and centering if you want.
They just launched so they only have two shells for now, but it looks like other options are coming soon.
It's seriously as easy as it can be and it's free.
Fullstory is user experience tool that lets you record your users as they visit your site to see if they're going through the funnel you intended. It also checks for bounces, rage clicks, and other bad UX holes you may not have realized.
I've never really had a tool like this. I heard about it from someone on my team who used it at another company. Basically, you drop the pixel into your site using Google Tag Manager and it just starts to work. You can watch your users browse your site, and it's really helpful to get non-biased data for your UX. Since we run an ecommerce site, it's also interesting to see if the user ever makes it to the cart and then watch them go back and forth to complete their purchase. It helps us figure out where we could make touch points clearer or easier