Bitrix24 Open Channels are a great free Zopim alternative. Zopim's greatest advantage is its integration with Zendesk. But Zendesk is a helpdesk, and sometimes you need a live chat + full featured CRM combination. That's Bitrix24, and it's free. Bitrix24 free website live chat widget offering is very generous. 12 free agents, unlimited chats, chat transfers between agents, customizable greeting message, after hours form, customer satisfaction agent rating and other features that are typically available only in the top plan. So, read Zopim reviews, look at other competitors, compare pricing with Bitrix24 and make your choice.
* Please note that the information may have changed since the publication. For current prices and features please visit Bitrix24 pricing page.