Many members of this site cut their teeth reimplementing proprietary Unix from scratch, e.g. the entire GNU project. Having an open source version of something

Many members of this site cut their teeth reimplementing proprietary Unix from scratch, e.g. the entire GNU project. Having an open source version of something is a laudable and noteworthy goal. Often many improvements are implemented along the way, since one doesn’t have to do the original design, e.g. the entire GNU project. I for one, am happy to see this.