Responcierge is not only free, but also includes many other engagement tools along with it built-in. It may replace as many as 8 other tools you would have to find different vendors for and pay on a monthly basis. Thank you for considering!
There is no other live chat software that's free for 10 agents w/ unlimited concurrent chats. Has web, native mobile and desktop clients for the agent. Integrates with Slack, Wordpress, Shopify, Google Analytics, Pipedrive, Segment and lots of other popular apps
Olark is one of the most popular live chat software. They have a free plan for 1 operator and maximum of 20 chats per month. For small startup it can be ideal.
Speaklyn uses Facebook Messenger to easily chat with users. Unlimited chats, unlimited agents, and push notifications makes Speaklyn very attractive to use.
Zopim is well-know chat software, and used on the biggest sites. But they have a free plan. Limitation is 1 concurrent chat at the same time.