Semaphor!

Riot (formerly Vector) is an opensource interoperable app running on Web, iOS and Android. It is built around chat rooms, both public and private and provides messaging, filesharing, voice and video conferencing (beta on Android and web), integrations to tools like GitHub, Jira, Jenkins and much more soon. Vector is built on the Matrix.org open standard which provides bridges to other systems such as Slack, IRC and a lot more soon. One can use the hosted service or run their own. »

Mattermost is an open source, self-hosted Slack alternative.

HipChat is an instant messaging service designed for companies and teams. It has persistent chat rooms, one-to-one chat, searchable chat history, file sharing via drag & drop and clipboard, inline image previews, an API, chat over SMS, and more.

dialog app is built and designed for corporate communication on all types of mobile devices - tablet, mobile phones etc.

With Crugo you can communicate, share and organize anything securely through the use of groups. With groups you can chat in real time, share files, monitor RSS feeds, create to-do lists and even organize calendars.Crugo focuses around groups. With groups you are in control. Decide what visibility you want and choose from a range of features to define each group based on your needs. Then simply invite others to join. It's that easy!

Microsoft Teams is the chat-based workspace in Office 365 that integrates all the people, content, and tools your team needs to be more engaged and effective.

Secure Chat is a Slack-alternative hosted in Switzerland. It provides a platform for teams to communicate and collaborate and share files. It has several features more than Slack, including end-to-end encrypted messaging, message threads, guaranteed deletion, and integration with ZenDesk and Trello.

JayPads are a mix of WhatsApp and Doodle - taking the hassle out of planning your next night out, your next weekend trip or dinner with friends for good. Simply:

Collabe is an ideal tool for any company size or industry and is quite effective in really boosting your collaboration efforts, resulting in significantly improved efficiency and productivity of your team members, as individuals and as a collective. The software focuses on driving productivity and efficiency by ensuring that the 3C’s of productivity is well covered and maximized – coordination, collaboration, and communication.

With Skarpline, you can chat directly on any card. For teams that use files and links, this can be a huge timer saver. Instead of attaching a file to an email you can now same time by communicating on the file itself. The more emails and versions you have, the more powerful and time saving Skarpline becomes.

Stride is the complete team communication solution with group messaging, video meetings, and built-in collaboration tools. Try free today!

Zala is a free messaging app available for iPhone, iPad, Android, smartphones, tablets, laptops and desktops. Zala uses your device’s Internet connection (LTE/4G/3G/2G/EDGE or Wi-Fi) to send and receive messages, checklists, photos, videos, audio files, documents and voice messages instantly with co-workers, friends and family!