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Where can I find open source portfolio management software? 
I've just recently launched an open source wealth management platform - wealthbot.io ...  "Webo" is mostly targeted at RIA's to help the manage multiple portfolios, etc. Take a look at the demo at demo.wealthbot.io, you'll also find links to github, etc. there. It's a rather involved project, but if you are looking for use cases of rebalancing, portfolio accounting, custodian integration, tax loss harvesting, and many other features available at some of the popular robo-advisors, you might find it interesting.