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I don't know about the same room, but in the same datacenter, certainly.

Mainframes aren't really some insulated-from-competition class by themselves anymore, though. For almost all jobs where a zSeries is an option, there are other options as well. In the modern market, I'd see a zSeries as just one product offering in a competitive market, not a product class on its own.

Full disclosure - I am a founder of a startup that develops an open source automated trading platform targeted at institutional investors.

As was mentioned in above postings, there are a series of open source tools available to bootstrap your trading system development:

• QuickFIX and QuickFIX/J (I'm also a developer of QFJ project) - a C++ and Java open source implementations of the FIX protocol, the underlying standard protocol for connectivity between financial institutions. Think of it as the HTTP of finance.
• QuantLib - an open source risk analytics package
• Esper - an open source complex event processing engine
• EclipseTrader - Eclipse-based open source trading GUI that's targeted more at retail investors
• ActiveMQ and AMQP and Qpid for messaging (AMQP standard was initially contributed by JPMorgan)

And then of course there's my company Marketcetera - we build on top of a lot of the tools mentioned above and others (ActiveMQ, MySQL, Ruby on Rails, QFJ, etc) to provide the basic underlying platform that institutional traders (think quantitative hedge funds) can use to build their proprietary algorithms and start trading. After implementing a few trading systems in a row ourselves for various trading firms we realized that there was an obvious need for an open source trading platform so that people wouldn't have to reinvent the wheel and write systems from scratch every single time.

To answer the OP's question about which commercial firms use FOSS: - a lot of proprietary trading software is implemented on top of OSS - JPMorgan famously built their trading GUI [PDF] on top of Eclipse, and Progress Apama is built on top of Eclipse RCP as well.

Not surprisingly, most trading applications are very Windows-heavy (although quite a few companies have Linux clusters, and some exchanges run on Linux as well). Most of the apps that your broker will provide for you to trade with are Windows-only (such as Bloomberg, Goldman Redi, MicroHedge, etc), and a lot of the APIs available from vendors are .NET or COM components and nothing else. We implement our systems mostly in Java (including the Eclipse RCP), thought have connectors for some of the Windows-specific components.

We know that flexibility is at the heart of any powerful trading application, and we think the open-source model maximizes the ability of our users to control the application. Some think the open-source model is antithetical to the secretive finance industry, but we see it as the perfect fit.

Then how do you explain that Euronext, and its platform liffe.connect (who runs e-CboT, Tiffe and all derivatives products of Euronext) is switching from Sun Solaris to Linux ? http://www.wallstreetandtech.com/showArticle.jhtml ?articleID=185301308

In order to understand what causes nerdism, we must first look to the nerds themselves. The most obvious observation one could make is that nerds are statistically nearly always male. While nerds routinely come in a splendid variety of shapes and sizes and hues, it is rare to see a nerd of the fairer sex. Since we know that nerdism is the fascination with tools and systems, and we know that nerds are predominantly male, we would likely gain insight in asking ourselves why females are not so driven to tinker.

There is no basic mental difference between men and women, and so there is no reason to believe that women would be mentally any less tinker-inclined than men. Therefore, in order to determine the reason why there are so few female nerds, we must turn our attentions to the ways in which men and women are known to differ: the physical ways. Immediately, the answer becomes plain. Women do not need to glut their tendencies by tinkering with computers or cars or guns because of their reproductive systems, which require a great deal more attention and maintenance than those of their male counterparts. Simply put, women tinker with their parts, and so have no interest in tinkering with electronic substitutes.

Penises and testicles, despite their initial lustre, grow boring early on. They do not exhibit quirky, moody, fixable behavior. Rather, they hang loosely and idly in a man's crotch and rarely get more attention than any other body part, and at those times that they do, tinkering is not foremost on the subject's mind. Particularly in the case of an circumsized penis, very little extra maintenance is ever needed. Contrast this, then, to the vagina, which must be carefully wiped after every use, and regularly cleaned to preserve womanly freshness. Females learn early in life that the vagina must be treated with respect, and in return they have the incomparable, primal joy of upkeep.

Women may contentedly seek non-nerdy sources of entertainment, safe in their knowledge that every month will bring them more new and exciting vaginal adventures. While some men profess to be unnerved or even disgusted by menstruation, their true feelings are probably closer to envy. Women, lucky women, may peruse those exotic aisles at the supermarket in search of feminine hygiene products, products that they need, they absolutely need, in order to keep their systems fully operational. Men never know the intimate thrill of personally dealing with menstruation by applying a tampon just in the nick of time, or the sense of deep personal satisfaction that comes with regularly eating yogurt and so having a

It has been going on for a long time...

http://www.wallstreetandtech.com/story/itWire/INW2 0021028S0008

http://www.websofinnovation.com/mar03ukcolumn.html

Here is a link about using wireless mobile at Starbucks. Here is a Wall Street article about it, and a brief intro. Here's an article praising the idea.