Kahla

Security is important when discussing business on the Internet, which is Kahla is an excellent communications solution in business-related environments. Of course, this doesn't mean that regular users can't use it to chat with their friends in a simple, convenient and secure manner. Also, judging by the developer's name (Aiursoft), as well as the application's name and icon, one could say that they're fans of the Protoss from StarCraft.

The application is free and open source, and you can have it up and running in no time. It's compatible with all popular Windows versions, and you can also use a web version on your preferred browser. Apart from a working Internet connection, there are no special requirements you have to meet to run this piece of software.

Kahla has a fairly simple user interface, which shouldn't prove to be a challenge, even if you're a complete beginner. Once you are logged into your account, you can switch between different sections, in which you can communicate in one or more chatrooms, organize contacts and add new ones, and manage your personal account settings. The interface is laid out like any modern chat application. You can select contacts or chatrooms on the left side, while the larger part on the right is where you can exchange messages and files.

The application provides full support for voice chat. You only need to click one button, after which you can speak with all your friends in a chatroom. If you need to exchange a document, chart or presentation, you can pick one of three options to upload an image, a video or a miscellaneous file.

Security is one of Kahla's strong points. Though it uses a central server, the software's end-to-end encryption will keep your messages private and safe from anyone, including the developers. What's more, the application automatically deletes old messages so you can be sure that no sensitive information will remain floating around the Internet.

Looking at the application's simple, but effective functionality, it's clear that some people dedicated their lives for Aiursoft to connect everyone to the Kahla server.