1) You imply that TOS was started in 2002 (2years R&D and 1 year beta test prior to the first 2006 release). I challenge you to prove that this started anytime before 2004.
2) You either misinform or are misinformed when you claim there is no such previous tool.
As a matter of fact, the similarities of TOS to another product, especially in its architecture and graphical conventions, are simply too many to be a coincidence. The personal version of that tool was freely available for download.
If you have not been with the company since the beginning, I urge you to check into it.
There is this perception that the open source companies are somehow more respectable than others.
I think talend should be honest about where they got the inspiration, the design, the architecture, feature by feature design choices, etc.
Thank you for acknowledging the 2005 start date...
Many of your examples you list are not valid as they too are recent efforts. For software professionals, it is quaint to suggest that the similarities between two products must be checked line by line at the code level. Here is a question: where did you get the idea to distinguish main rows vs. lookup rows and which of the examples you cite has it?
version Kettle 2.4 it already had 100.000+ downloads