General information about the Joinup platform.
It is not price which sets FLOSS apart from proprietary software. Some proprietary software is distributed gratis - so-called "freeware" or "shareware" - without giving the four freedoms described above.
On the other hand, FLOSS is not without costs. The software itself may be available at zero price, but the distributor may charge for various services, such as packaging the software, making it available, providing documentation and maintenance, or adapting it to a client's needs.