Please suggest me
ACalculator.com is best online calculator for graphics & You can use it without any cost.
AWESOME!!! They have Australian Loan Calculators!!
You can use cemetech's jsTIfied. It's the best one I know. You will need a rom image though, so if you can find one or get one off your calculator then you should be good :)
You can also use Wabbitemu to generate a ROM, but you must download the program to your computer.
Wabbitemu can produce ROMs that may be illegal depending on where you live. Obtaining a ROM through Wabbitemu without using an actual hardware calculator is illegal in the United States and other countries.
Alternatively, you can use rom8x to build you own legal ROM. You can also use TiLP's ROM dumper as well.
Demos is a good one if you are just graphing. It does regressions, tables, adjustable values, etc.