For years now, Slack has been the de facto standard app and service for collaboration and group communication. There are good reasons for this: Slack is consistently reliable and extremely configurable, offering numerous options to workgroups large and small.But for some users, Slack's proprietary license is a hard pill to swallow. On top of that, Slack can get pretty pricey (even for businesses). And because Slack is a cloud-based infrastructure, it presents the same security and privacy issues... Read this story
