सॉफ्टवेयर को सामान्यतः कितने मुख्य वर्गों में वर्गीकृत किया जाता है?

A text editor (such as Notepad) is categorized as:

Software whose source code is kept secret and not made available to users is known as proprietary software or closed-source software. Which term refers to software provided free of charge, though its source code is typically not available?