Has anyone some idea what kind of software can be used for such an enterprise?
Software is something I know very little about, so my recommendations have no weight.
QueerDay used
MovableType. It seems to have served him quite well, though Philo is also handy at web designing, so much of the resulting product may be his own craft-work and not the result of any particular software. MovableType is a fairly popular choice among bloggers. Of course, Philo considered QueerDay to be nothing more than a weblog. But what is a weblog if not a small newspaper with a devoted and outspoken editor? As Mr. Hagen pointed out in his FAQ page:
Why are you doing this?
I never found the lgbt site I always wished existed, so I decided to create it. Queer Day had grown weary of what passes for our press poorly rewriting stories and press releases and passing them off as news. I routinely give you a slice of what to expect and give you the link to the source so you can go get the rest of the story.
I have a hard time criticizing "our" press -- at least we have a press. We very much need one. There cannot be too many gay news outlets, and complaining about a particular slant or bias to the coverage or even the quality of the writing is of little use. All these charges are reasons to start up even more outlets.
Still, it seems to me that too many of our press outlets are merely acting the role of journalists, rather than being journalists.