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.
But bullying by a co-worker can be considered as creating a hostile work environment if your employer or supervisor is aware of the situation and does nothing to stop it. There's no specific law against bullying in the workplace, but if it occurs due to discriminatory factors, this is against the law.