...including any companies which did not originate (i.e. produce) the aforementioned specific programmes.

That's my slightly tentative reading of it, unless there's something I'm missing.

This seems rather ambiguous. When you're around at the start-up of something, there is an implication that you are somehow responsible or complicit, but the wording I chose leaves the question of active participation open.

Any developments whether or not they arose from the original (specific) development programme shall be made available to the group's companies.

They definitely mean development here. It takes tens of developments to reach one good program.

Is how I read it

I have thought about this for at least 30 seconds, and come to the following conclusion.

The expression "toutes..., y compris" suggests very strongly that what follows is included in the "toutes". This leads to a false agreement, since "ceux" is masculine and "toutes les sociétés" is feminine, as has already been pointed out. However, I think the suggestion of "toutes" before "les sociétés" and no "tous" before "Les Développements Spécifiques" is too strong to resist. I think the author is clearly a crap writer, and it is no surprise that he stuffed up the gender.

Another point: "des dits [sic] programmes spécifiques" seems to be just another way to refer to the "Développements Spécifiques". Why? Well, for one thing, there does not seem to be any reason for them to be the "said" programs, and in any case one is left wondering what the term is referring to if it's something different. And what do software people develop anyway, if not programs? This more or less gets rid of the possibility that "ceux" refers to the "Développements Spécifiques". (I do need some argument for this, because it could be argued on the contrary that the "y compris" relates to the "Tout" before "Développement Spécifiques", but this would, on my interpretation, result in the developments being at the origin of themselves....)

So what I think is happening is this. Different companies within the group may request the development of special programs for the needs of that company, but the software company is to ensure that these programs can be used by all companies in the group, including those not "at the origin of" (i.e. not having ordered) the program(s) in question.

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Note added at 4 days (2007-07-13 14:29:34 GMT) Post-grading
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It happens. I even awarded myself the points on a question once, due to a technical glitch... (The asker sent me an email about it, which included a link, and the link had the password in it....)

French term (edited): qui ne seraient pas à l'origine

I'm re-posting my original, later hidden, answer, as it has been referred to by others.

I've phrased it rather clumsily like that, to follow the FR word order in your question, but actually I think it is essential here to turn it round to make it read more naturally in EN.

I have to admit, I'm not quite clear in my mind exactly what the relationships involved are here, but it seems to mean:

"...must be able to be implemented immediately by any of the companies in the X Group worldwide, even ones that may not have been originators of said Special Programs"

But like everyone else, it is the gender conflict between 'sociétés' and 'ceux' that worries me — and I hate having to assume an error in orer to make my answer work!

Anyway, here it is for what it's worth!