OTR hasn't aged very well (it doesn't support asynchronous communication, multiple parties or multiple clients per party). For XMPP there is OMEMO, which is gaining traction (and is based on the Signal ratchet), but like with OTR, the forward secrecy it provides might be unwanted or even forbidden in corporate environments where you have retention policies in place. E2EE is great for private chats over an untrusted cloud provider, but really not a priority in enterprise environments.