Vivaldi is a cross-platform browser developed by Norwegian company Vivaldi Technologies (co-founded by a former Opera CEO). It provides highly customizable UI and integrated tools (like an email client, calendar, and RSS feed reader). Privacy is core to its design: Vivaldi blocks ads and trackers natively and encrypts synchronized data end-to-end, and the company states it will not track or profile users. The browser is open-source and independent, built by an employee-owned European team with no outside investors. It targets power users who want a “personally tailored” browsing experience with advanced tab management (tiling, stacking, workspaces) and unique features like side-panel notes and web panels.