The most popular open-source (or mostly open-source) operating system for personal computers are the various flavors of Linux.
There are several open-source operating systems, most of which appear to be clones of Unix. Examples include FreeBSD, Linux, Minix.
Personal Savings
state and federal funds
A bank loan or a loan from friends/family.
There are different types of operating systems. The most popular ones are Microsoft Windows and Linux which is an open- source operating system.
With an Operating Budget Authority Document (OBAD)
sales tax
sales tax
Block Grant.
Android is an open-source mobile operating system by Google, currently the most popular available.
Microsoft makes the most popular operating systems, eg:Windows XPWindows VistaWindows 7They are propriety operating systems (made by a company and sold). You can also get open source operating systems which are free, eg:Linux Ubuntu