A list of some website-related tools:
Use Neil Patel’s backlink checker to see who is linking to your website.
Broken links on your website are really annoying, especially since they’re good at hiding. Use the Broken link checker to find all of them!
Want to check whether the contrast between text and background on your website is big enough to be legible? Kontrast is a nice tool with free Firefox and Chrome addons.
When you need to create images for use in online promotion material, hotpot might be a nicer way to work than Photoshop. You start by picking a template from one of their categories and then you can edit them right then and there. You pay $1 when you want to download your finished image. Take a look at what they offer. You might like it. The picture of the blue orange was made at myhotpot.io
For free illustrations of humans, take a look at Humaaans.
In need of SVG illustrations? Look at unDraw.
Whether you have a lot of experience with Photoshop or Affinity, removing the background from a photograph is never fun. This web application isn’t infallible and you might have to tweak it a little but removebg can simplify the process. And with 50 free ones a month, it’s worth trying.
You can test the responsiveness of your website in your browser, especially Firefox and Chrome are good for that but the Responsinator is a sweet online tool you can try as well.