I have been using LibreOffice since it was called Star Office and all documents opened in a tabbed interface, as in most modern spreadsheet applications (anyone remember those days?). From those early days until now, I have considered Star Office/OpenOffice.org/LibreOffice to be an excellent, if not superior, tool compared to many on the market.
Don Parris wears a Facility Services cape by day, and transforms into LibreMan at night. He has written numerous articles about free tech, and hangs out with the Cha-Ha crowd, learning about computer security. He also enjoys making ceviche with his wife, and writing about his travels in Perú.