yes i created a data visualisation tool for Tally written in java it collect data from tally and display as pie chart,bar chart,line graph etc.... i also added cool features which help owners to analyse their data like Sales-purchase graph,Top customers vs Top Items ,outstanding receivable chart and lot more here is the screen of my application
almost every programming language had data visualisation libraries like python has matplotlib java has javafx charts c# has charting javascript has d3.js R has built in handle for charts or you can simply write a vb script in excel to achieve this so its up to you pick a language and search for it
can i know, is it possible to show the graph in tally screen itself or it opens a new window for the charts
i think there is no support for data visualisation in tdl or dynamically you have to generate a image of graph with dll and show it in tally screen but it is not flexible so external application will be better if you more concern about visualising data in real time with attractive charts and design