PHP (Score 1)

I'm not sure if our PHP usage would qualify as "enterprise" but we do use it where I work (one of the rather large telecoms). Me and a co-worker were asked to build an inhouse tracking system to handle the work that the entire office does (a little over 150 users in this particular office and we needed to track the work flow of about 16,000-18,000 work orders a month). We were given a budget of exactly $0. Options were limited. We chose apache, PHP and MySQL. We initially ran it on a spare desktop with Win2k Pro. It has grown to cover 4 offices (each with their own desktop ha!). Our office finally got to "ugrade" so we spent about $500 and threw together a cheap dual processor system running the LAMP combo. We can easily go 9 months to a year between reboots. Now our little "system" serves about 800 users total, tracks almost 3 million work orders (and counting) and has cost next to nothing. All we had to do was break the corporate standard to get it done (calling it an ongoing test helps)... but it works and all support comes from me and my co-worker so IT doesn't bother us. I can vouch for PHP as a viable solution when budgets are tight (they always seem to be tight for some odd reason)... it works and works well. Considering that any changes to the legacy systems used in office can cost over $4,000 (for the tiniest thing) and people can call us up and we make changes in about 5 minutes at no cost... people love it. Apache, PHP and MySQL has been a godsend for almost 3 years now