From their website: "Otter Browser aims to recreate the best aspects of the classic Opera (12.x) UI using Qt5." Their motto is: "Controlled by the user, not vice versa". Version tested: 0.9.12 (SlackBuild from slackbuilds.org). Program used for testing requests: Mitmproxy.
Otter Browser <b><fontcolor=lime>makes no unsolicited requests at all.</font></b> It is fully open source. The developers, also, don't plan to include any spyware "features" in the future. This seems like a true privacy-based web browser (at least for now).
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