SPSS is not mandatory, rather it is helpful in research analysis and user friendly.

Any researcher can use other packages also.

You can also use other software such as Matlab, Eviews, Stata etc.

Thank you sir (Dr. Kundu). Please mention the name of other packages which will be free downloaded.

Everything depends on what statistical tests you plan on running. A lot of common tests, like t-tests and analyses of variance, could actually be done by hand, as they're just basic math formulae (although people rarely do them by hand anymore since most software has built-in functions for these). For analyses that are computationally intensive, like bootstrapping and permutation tests, computer programs are useful to automate these sorts of repetitive tasks. The only time any particular program would be stricly necessary is if it implements some statistical test that no other program implements (although even then, if the test is well documented then it should be possible to do the math by hand or in any other computer program). That being said, most people prefer to use statistical programs because they have built-in functions for most common statistical analyses, and using such functions is a good way to avoid errors that someone might make when doing the math by hand. There are many different statistical software packages available (including the ones Ivan mentioned; as well as R, which is free and popular; and many others), SPSS is only one of them. It doesn't really matter which one you choose to use; they all have their advantages and disadvantages (the relative advantages and disadvantages of various stats software packages have been discussed in many places, including the Researchgate forum; if you search online you can easily find a lot of information on this).

We have other softwares for use, such as SAS, R-package, etc. SPSS is only one of the many available choices. 

Some statistical packages are SigmaStat 2.03, SYSTAT 9, JMP 3.2.5, S-Plus 2000, STATISTICA 5.5, UNISTAT 4.53b, SPSS 8, Arcus Quickstat 1.2, Stata 6, SAS 6.12, and StatXact 4. These may be used by the researchers according to the nature of their problems.

For details, Check the link!

www.ats.ucla.edu/stat/mult_pkg/library/CompBinary.doc

for preparing the dissertation report, a lot of statistical tools are used for analysing the data. The  SPSS is a user friendly software that helps the researcher to make the research work more scientific and reliable. how ever it depend upon  the nature of research and complexity of data used in the research by the researchers. large number of other software is also available in the market whch can do the same as SPSS does it. so it is not mandatory but may be used as per the nature of the problem under study. 

Thanks to everybody.

It is mandatory that you must use SPSS because there are some packages you can also use e. g. STATA and R

If you use some statistical package for data analysis , it would be easier for you to do statistical analysis as per our requirement within less time and the calculation would be perfect.

ANOVA, correlation coefficient carried out through MS Excel by "Data analysis" option. Is it right choise without use of any statistical package? 

Depending on your objectives...unlike nasty nasty DJ who used SPSS in biotech, biochem and sometimes to assess marine biodiversity.

Its not mandatory but you have lot of options to derive variable(s) from your data and draw inferences is you use SPSS.

It is not mandatory to use SPSS. We can try to explore some open source statistical software. The best among them is R. It is a very useful statistical software.

SAS is an alternative for stastics. Moreover, fuzzy calculation is out of the range of these packages using.

Not necessarily. If you have quantitative analysis you can use SPSS, STATA, SAS, R etc. SPSS is user friendly and good for data management. It also give you quality graph. If you further clarify what you want to do with SPSS can be help.