Some mobile ad networks don't require you to install their SDK. Google AdMob allows you to run ads without integrating an SDK if you use their mediation platform. Facebook Audience Network can be integrated using a simple web-based setup instead of an SDK. Media.net also provides a lightweight solution with minimal integration requirements. These networks offer simple ad formats that can be implemented through basic JavaScript or HTML tags. However, using their SDK typically provides enhanced features like better targeting and analytics. Choose a network based on your technical preferences and the features you need.