Most free software licenses are based on copyright, and there are limits on what kinds of requirements can be imposed through copyright. If a copyright-based license respects freedom in the ways described above, it is unlikely to have some other sort of problem that we never anticipated (though this does happen occasionally). However, some free software licenses are based on contracts, and contracts can impose a much larger range of possible restrictions. That means there are many possible ways such a license could be unacceptably restrictive and nonfree.
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Up to three people on their PCs can use the browser to video chat and even share screens, all without fees or any setup other than sharing a URL. Sign up for an account or sign in with your Google or Facebook accounts, and you can claim a regular-to-use meeting "room" online. Because it's Web based, it works for Linux, Mac, or Windows, even on a Chromebook.
Described as a "messaging app / former Emperor of Austria," you can tell from the Web page that Franz is gonna be fun—and useful. The sheer number of services it supports is huge: Slack, Facebook, WhatsApp, Skype, Google Hangouts, Twitter, Gmail, Outlook.com, and HipChat are just the start. You can add a service multiple times if you have multiple accounts.
A special issue arises when a license requires changing the name by which the program will be invoked from other programs. That effectively hampers you from releasing your changed version so that it can replace the original when invoked by those other programs. This sort of requirement is acceptable only if there's a suitable aliasing facility that allows you to specify the original program's name as an alias for the modified version.
Apart from these two organizations, the Debian project is seen by some to provide useful advice on whether particular licenses comply with their Debian Free Software Guidelines. Debian doesn't publish a list of approved licenses, so its judgments have to be tracked by checking what software they have allowed into their software archives. That is summarized at the Debian web site.
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