In most cases, the answer is yes. Check the license for each file you are using.
Most of our board designs are licensed under the Solderpad Hardware License, version 2.0. This license allows anyone to use and redistribute the designs, including for commercial purposes. If you distribute our design files, or a design derived from our design files, you must include the license files and Feliform Labs copyright notices.
Most of our software is licensed under the Apache License, version 2.0. This license allows anyone to use and redistribute the software, including for commercial purposes. If you distribute our software, or software derived from our software, you must include the license files and Feliform Labs copyright notices.
Some of our board designs and software are not published because they are not done or we've been focusing on other things. We're usually still happy to share the files or at least talk about how things work.