It’s published by Sussex Newspapers Ltd, based in Horsham, which is a division of the Johnston Press nationwide publishing group of regional and local newspapers. The editorial offices are in Haywards Heath and are shared with the Herald‘s parent title, the paid-for weekly tabloid the Mid Sussex Times.
It has no website of its own; the link below is to the Times‘s website.
Until recently it was known as the Mid Sussex Citizen. It underwent a revamp under that title in late October 2012 as part of a general relaunch of Johnston’s paid-for newspapers, but was then relaunched in March 2013 under the present title, joining the Crawley-based Weekend Herald series. The publication date switched from Wednesday to Friday at the same time.
The e-edition appears to have been withdrawn at the time of the retitling, although e-editions of the Citizen are still available by a web search.