Qt 4 supported the same set of platforms in the free software/open source editions as in the proprietary edition, so it is possible, with Qt 4.0 and later releases, to create GPL-licensed free/open source applications using Qt on all supported platforms.
Hostile work environment and harassment. A hostile work environment is really just a specific form of harassment. unwelcome conduct that is based on race, color, religion, sex (including pregnancy), national origin, age (40 or older), disability or genetic information.
All sorts of behavior can create what employees deem to be a hostile work environment. But, in the legal sense, a hostile work environment is caused by unwelcome conduct in the workplace, in the form of discriminatory harassment toward one or more employees.