The new Arc Browser has a lot of industry buzz. Has anyone used it with Coda? Getting an invite has proven difficult and the wait list is massive.
Personally, I use https://www.meetsidekick.com/ (Sidekick) on a Chromium basis and therefore open source.
It allows multi-accounts and multiple sessions management among many other things ^^
It looks great in Arc - Arc runs on Chrome, so it has that look and feel to it.