So far I used dataforseo.com to get the data I need (they have a large database with 4.8 billion keywords), and I could create some cool tools with it! I share the first version of the tutorial on my website called amigocci.io but I started to make it only 2 months ago so I'm still figuring it out and trying to find the best way to make analysis with it. Source: about 1 year ago

I can't think of any free tools, but there are some APIs out there that are pretty cheap like https://dataforseo.com/ or https://serpapi.com/pricing. Source: about 1 year ago

Dataforseo.com you can get the same data as SEMrush and other similar tools. Source: over 1 year ago

I like to think that I'm typically aware of great tools to aid in SEO but I was just informed of one that's a game changer. https://dataforseo.com/. Source: over 1 year ago

If you have a Google Ads account, the Keyword Planner tool will give you estimates-- broad monthly ranges if you don't have any ad spend, or closer approximations if you have paid spend. It recommends similar terms, too. SEMRush has a free version where you get ~10 queries per day, so you can explore search volume for terms like "test automation software" and drill down from there. It won't 100% match GKP, but... - Source: Hacker News / almost 2 years ago

If anyone has done any Website content building, you be familiar with a WordPress plug-in called "link Whisper" (https://linkwhisper.com/) that does a similar thing by suggesting new internal links to relevant older content to new content that you are currently writing. Source: over 1 year ago

There are also tools to help you with internal linking (Link Whisper is one, https://linkwhisper.com). Source: almost 2 years ago

Seen https://linkwhisper.com mentioned a lot. Never used it. Source: about 3 years ago