There are a number of commercial or for-profit entities that are often confused with similarly-named or widely-used open source projects or products. This listing is a very brief selection of some of the major commercial entities people might think of, to serve as an example of some companies that are not in the foundations listing.
Notable Project(s): Chef; Progress
Progress Chef is the new Chef Software, Inc., main driver of the Chef line of defops tools.
Notable Project(s): RHEL; Fedora
Red Hat Enterprise Linux (RHEL) is the commercially supported version built atop the open source Fedora project.
Notable Project(s): Docker
Docker has always been a commerical company with a number of open source provided tools.
Notable Project(s): Firefox
Mozilla Corporation is a for-profit, wholly owned subsidiary of the Mozilla Foundation, a 501(c)3 non-profit.
Notable Project(s): MariaDB
MariaDB plc is the current publicly traded commercial company building atop the open source MariaDB SQL database.
Notable Project(s): SUSE Linux Enterprise; openSUSE
SUSE supports commercial Linux distros atop the openSUSE project.