The best alternatives to On/Office are Disk Sensei, Space, and Hubs by Mozilla. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of On/Office?
AssemblyAI— Speech-to-Text API with superhuman accuracy
Hubs is an immersive social experience that is delivered through the browser. You simply click on a web link to begin interacting with others inside virtual reality.
Teemyco is your office, online. Teemyco users do more than just collaborate, they co-exist in their virtual offices, no matter where everyone is located. Teemyco enables real ad-hoc interactions and brings teams together. Try it for free with your team now!