What are the purpose of open-source software?

SQL is not software in the sense that you can run it as a stand-alone program. SQL stands for Structured Query Language and is that a language for querying relational databases. It was originally...

If you cant figure out the source of your software / web application. It is not an open source design. Need to figure out which open source technology will suit you, mail at...

Generally you need to pick your source from an existing shapefile. If you have not done so it is considered "open source" This is a guess by the way.

It is free for all.Someone can just download and use it .

Yes it is.