Best Performance Measurement Software?

Anyone have any recommendations for and/or experience with performance measurement / attribution software? I have multiple brokerage accounts through multiple providers and I'm looking for a software that will aggregate all the transactions / cashflows to calculate total performance + provide performance attribution (how much did each position contribute to % gain, what sectors/geographies performed, etc). Also looking for the option to add in private positions, like real estate holdings / PE. I realize this can probably be made in excel in a couple hours, but I'd rather find something quick and convenient. If anyone has any ideas, please let me know!