ThinkPrivacy is described as 'It's your data. It's time you take control of it' and is a Privacy Tool in the category. There are more than 25 alternatives to ThinkPrivacy, not only websites but also apps for SaaS, Mac, Windows and Linux. The best alternative is AlternativeTo, which is free. Other great sites and apps similar to ThinkPrivacy are PrivacyTools.io (Free, Open Source), PRISM Break (Free, Open Source), alternative.me (Free) and Riseup (Free).
AlternativeTo let you find new Windows, Mac, Linux, online and mobile software based on applications you already know instead of useless categories. AlternativeTo is a new approach to finding good software.
You are being watched. Private and state-sponsored organizations are monitoring and recording your online activities. privacytools.io provides services, tools and knowledge to protect your privacy against global mass surveillance.
Riseup is an organization which provides online communication tools for people and groups working on liberatory social change. To create democratic alternatives & practice self-determination by controlling our own secure means of communications.
When I am exploring alternatives to a product or service, I often to go Google, type "[product] vs ", and just see what it autocompletes. That usually tells me the most popular competitors. If I want to be thorough I'll do the same for the competitors, etc.