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I suppose it will be difficult to provide a precise response as it is a fairly vague question and the reality is quite diverse. From my personal experience, the Quant I used to work with are using techno as R, Matlab combined with Visual Basic. Regarding more sophisticated tool coded in Java or C#, they are most of the cases inhouse frameworks. So the only ...
Strata seems like a fairly well designed library, which is an open source library designed by OpenGamma. From their docs Strata allows financial systems developers to build or enhance existing applications with standardized, off-the-shelf market risk components. It provides all the core concepts and market risk functionality at the heart of the ...
Here is library for time series modelling. There are exponential smoothing models (simple, double, triple) with maximum likelihood estimation and another time series utility classes: https://github.com/hawkular/hawkular-datamining http://www.hawkular.org/docs/components/datamining/index.html
You can try TimEL, a Java library I've been writing to evaluate expressions for time-series data.
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