What is the best tool available for software development life cycle?

We are planning to develop a software in any programming language (not decided yet). We are still exploring which is the best programming language for this software… or may be a framework such as MVC…

All i want to explore to any application or tool, which can help me and my team to develop a quality product…..

The tool should be able to tell/direct us

1) What should be the software standard ?
2) What are various factors we should take care of while developing this software?
3) And…

What is the best tool available for software development life cycle?