Tools are decided by Management i.e., the company you work

for. since some tools require budge. Some tools can be

downloaded from online and free to use.

Depends on the Project - if the project has any future

releases - a test management tool is necessary and for the

regression purposes, an automated tool is necessary to

execute regression scripts.

If the project is used by a large number of users, to know

the performance of the designed application a performance

test tool is necessary.