Google Tag Manager is described as 'Digital marketing made (much) easier' and is an website in the Network & Admin category. There are more than 10 alternatives to Google Tag Manager, not only websites but also apps for a variety of platforms, including SaaS, iPad, Self-Hosted solutions and Android. The best alternative is Matomo, which is both free and Open Source. Other great sites and apps similar to Google Tag Manager are Segment (Freemium), Piwik PRO Analytics Suite Tag Manager (Paid), RudderStack (Free, Open Source) and Stackpile (Paid).
Segment is the analytics API you've always wanted. Instead of integrating with Google Analytics, Mixpanel, KISSmetrics, etc. individually, you integrate with a simple, clean API once and you can send your data to all of them.
RudderStack is an open-source, enterprise-ready platform for collecting, storing and routing customer event data to dozens of tools. It provides a powerful transformation framework to process your event data on the fly.
CustomerLabs CDP helps marketers track, identify, segment & sync their customer data without writing a single line of code. Unify customer data across your marketing, sales & service channels. Create segments & sync them with your existing platforms.
MagicPixel is a server-side tag management solution for web and mobile apps compliant with CCPA / GDPR / ITP/ ETP. Improve your site performance and better first-party data collection that works around Adblockers.
Kodelss helps marketers gain control over the data they collect from the website, and eliminating their dependency on developers which is what causing all the things that are wrong with their data today.