The workflow diagrams are used to organize steps of plans, describe processes and their relations among them with input-output information. To organize and manage their projects faster and easier, many companies and organizations use workflow editors. Because of this huge demand, software designers try to produce the most suitable product for costumers. There are diagram editors working on Internet which fulfill the needs of some customers. However, there are a lot of problem that customers encounter. First one is the compatibility issues of the programs, which are caused by the plugins that these programs use to work properly. The second problem is once again compatibility issues which are brought about using different Internet browsers that users use. These issues are frequently encountered by users because most of the designers of the workflow editor programs do not consider these compatibility problems. They write the program working on specific Internet browser and give the program to the users. However, when user tries to enter to the program using an Internet browser which is different that the browser that the program written for, then because of a little compatibility problem, whole program runs incomplete or directly fails. The third and the last problem is that most of the workflow diagram editors work slowly, which causes to make users annoyed. This issue is cause by the usage of the additional programs in the main program. Especially, using plugins cause system to be slower. To sum up, the program that will be designed should not depend on any outer program or plugin, should run on all of the Internet browsers and should run fast enough so that user uses the program with pleasure. It is important to see sample works on something, because it broadens the horizons of the designers which provide to give people the best product. For this purpose, being open source is the best idea to perform these. However, there is not enough open source programs designed on workflow editors. So, the system that will be designed should be open source.