As a web developer currently working on a Debian laptop I don't know which software I would want to buy if I was using Windows or a Mac. Everything I was using

As a web developer currently working on a Debian laptop I don't know which software I would want to buy if I was using Windows or a Mac. Everything I was using for free to do this job with Windows in 2008 was also available on Linux for free, that's why I moved to Ubuntu in 2009. I never had to buy any software in all these years but maybe my use cases are pretty simple.