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Tinc is an open source peer to peer VPN daemon. Find more information at <a href="https://www.google.com/url?q=https://www.google.com/url?q%3Dhttp://www.tinc-vpn.org%26sa%3DD%26usg%3DAFQjCNGEeCroJt_zx9EyfZxD833oflrI7Q&sa=D&usg=AFQjCNEotWcvHHPZU_Y-AAMR9p4DiYtaZQ" target="_blank">http://www.tinc-vpn.org</a>.
Tinc GUI for Android is a (slightly modified) cross-compiled version of tincd, associated with a basic GUI for daemon management.
Root access is highly recommended for correct tinc daemon usage (no success has been reported on non-rooted device until now).