Media companies handling publishing space

Can you add some examples of media companies handling publishing space for your site ?

if I do not wish to register with adsense, still I do want to sell my site`s publishing space, what other options do I have ? Where can I turn my attention to ?

In Romania there used to be Boom - but now they went bankrupt. For now the big publisher can go to :

AdEvolution
Arbomedia
Splendid and maybe Neogen.

Please share the media companies handling publishing space that you know!

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I am working on SEO/SEM industry for quite a while, so you can find me most of the time in the
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section of the forum!

What you show are very important about the company handing publishing space. what you sell is very valuable and promising . good luck.