custom-built, custom-made, made-to-order, personalized, specially made, tailor-made, tailored. Slang: pimped-out.

This is like this If somebody wants an already existing standard software to customize it to suit his needs, this is called a customized software eg: Tally software (an accounting software) customized to suit various clients as per the requirements Custom software or custom made software or tailormade software is one where the developer develops the software keeping in mind the specific requirement of the client so that the same can be used specifically by him. Making a custom made software is going to be an expensive affair, though that is the best way you can get the desired software according to the needs

I would imagine customized software as being written for many different people, but having the ability to specify applications that would suit a specific purpose for a business. Although the program could be for general use, there will be features "customized" for the end user.

Custom written software gives the impression that the software was written from the ground up for that one intended client.

Most Nike custom running shoes are not made in the USA. They are manufactured outside of the country and then brought in, but then customized to fit your foot.

Custom made software refers to a program or application that is specifically designed to meet a particular need. Some organizations will need customized software for their operations.