Google Trends - A good tool for understanding seasonal content. It also displays results in a more visual way but presents much simpler results than Keyword Planner. It shows interest in keywords and search queries, but doesn't give you the exact number of searches or your organic position. It is definitely worth having with Keyword Planner, but I wouldn't recommend only using Trends.
Smartling - Smartling’s Translation Management Platform is an end-to-end solution for digital content translation designed to simplify and streamline translation by eliminating 90% of the manual processes and costs associated with localization. Smartling’s advanced technology centralizes global content in the cloud and integrates seamlessly with any tech stack to provide visibility through a centralized workplace and deploy flexible workflows that enable team efficiency and ensure translation accuracy.
TalkWalker Alerts - This is a free alerts tool to help you find versatile opportunities for link building quite easily - for instance if you set up alerts for your brand name or keyword, you’re going to get a list of posts which mention your brand and/or keywords. You’d be surprised at how often people mention you but don’t link to you! After you're done identifying a list of these posts, reach out to the authors and request that they link back to you. You can track mentions on Twitter, blogs, and discussions.
It may not be widely used yet, but by all accounts, visual search is set to become an extremely efficient and popular method of online search. It likely won’t ever surpass text-based searches, but as AI improves more people will certainly start using it. Some mobile phones already have AI implemented in their camera functions that will help speed the use of this technology along.
Platform-Based Social Media Analytics are the free analytics tools built into social media platforms themselves – on Facebook, Twitter, YouTube and more. Though other tools can aggregate your data, looking at platform-based analytics allows you to look at each account as a unique entity, devising different strategies for each social media platform.