VisIVO is an alternative tool for working with virtual observatories. Muna, in his 2016 paper "Introducing Nightlight: A New FITS Viewer", observes that SAOImage DS9, TOPCAT and Fv are the most common tools used to view FITS files. It is suitable for use as a graphical viewer and data editor of tabular data from FITS and other sources. Written in Java, TOPCAT can be used both standalone and within a web browser. Initially funded from the Starlink Project it has been funded by various other projects since. Taylor acknowledges inspiration for some features from Mirage from Bell Labs and VOPlot from VO-India. The project was initially developed by Mark Taylor, an astrophysicist from the University of Bristol in 2003. The Acronym TOPCAT derives from Tool for OPerations on Catalogues And Tables. It is able to handle several digital file formats including FITS which is in common use in astronomy. Although a general purpose tool capable of handling large and sparse datasets with correlation functionality its specialist application area is astronomy and it was initially designed to support virtual observatories. TOPCAT is an interactive graphical viewer and editor for tabular data.
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