pandu web dev wrote:Some project managers said one reason is
It is because for Big projects needs to work in teams, So it can't be given to individuals and also communication problems etc.
It is a fact that many business projects fail either partially or completely. Many studies demonstrate this. And I suspect that many of those failures are attributed to project management failures.
Thus a project manager probably isn't the best source to evaluate why a broad category of projects fail.
Below is one stat for Apache server, which is a public domain and open source server. From it 60% usage from the top (usage) 10 million web sites in the world. How do those "project managers" explain that success? (There are a vast number of addons for apache.) There are many more examples of this.
pandu web dev wrote:said one reason is
One reason individual projects fail is just due to lack of interest when there are very few participants. An initial project needs several dedicated enthusiasts who spend years actively supporting a project until many people start using it. If the first doesn't happen then the second wont.
I am not going to research it in detail but I know for a fact that there used to be a free shopping cart system written in perl. There might be something now in a different language. You can try googling for that.