An independent browser made with a love for Arc's best ideas, including Spaces, a calm sidebar, and Peek.
Crest
Crest is an open-source (MPL 2.0) Arc-inspired browser for Mac, iPad and iPhone. It recreates Arc's Spaces, sidebar, Peek and Split View, runs Chromium with per-site WebKit, supports Chrome extensions, syncs through iCloud and imports from Arc, Zen, Chrome, Safari and Firefox.