'Mattermost, a startup developing what it characterizes as an open
source messaging alternative to Google's Hangouts Chat, Atlassian's
HipChat, Slack, and Microsoft Teams, today announced the closure of a
$50 million series B funding round. The round was led by Y
Combinator's Continuity Fund, with participation from new investor
Battery Ventures, as well as existing investors Redpoint and S28
The capital infusion follows a $20 million series A in February and a
$3.5 million seed round in February 2017 and brings the Palo Alto,
California-based company's total raised to roughly $70 million. As
part of the round, Twitter COO Ali Rowghani will join Mattermost as
board director and Battery Ventures' Neeraj Agarwal will join as a
board observer. The raise comes as monthly downloads of the open
source project pass 10,000. To date, more than 1,000 contributors have
helped translate Mattermost into 16 languages.'
-- source: https://news.slashdot.org/story/19/06/22/0243233
Haven't even heard of Mattermost before...
In terms of "Slack":
"Should Slack-Like Chat Clients Replace Email?"
Personally, I'm not a fan of chat, as it is even more disruptive than email.
Dept. of Computer Science
University of Waikato, NZ
+64 (7) 858-5174