I would strongly recommend you do NOT use OpenX. I used it for a few years, but eventually got fed up with the constant security problems. They do not promptly release patches for known security problems, so after seeing a particularly widely available remote exploit go unpatched for months early this year, I had to replace it with DFP.
This is a problem with the downloadable version, which is written for the LAMP stack and grew over something like 10 years as an open-source effort. Not surprisingly, YMMV (as with all OS software).
The hosted version (called OnRamp) would be the place to start - it's free, performs better (it's not all PHP), and gives you easy market integration (which the original comment was referring to). OpenX may or may not be what you're looking for, but at least you can test the waters without any initial investment other than creating an account and setting up a few tags.
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I would strongly recommend you do NOT use OpenX. I used it for a few years, but eventually got fed up with the constant security problems. They do not promptly release patches for known security problems, so after seeing a particularly widely available remote exploit go unpatched for months early this year, I had to replace it with DFP.
This is a problem with the downloadable version, which is written for the LAMP stack and grew over something like 10 years as an open-source effort. Not surprisingly, YMMV (as with all OS software).
The hosted version (called OnRamp) would be the place to start - it's free, performs better (it's not all PHP), and gives you easy market integration (which the original comment was referring to). OpenX may or may not be what you're looking for, but at least you can test the waters without any initial investment other than creating an account and setting up a few tags.
(Disclaimer: I work for OpenX.)