system
Given the following post, respond as if you're commenting on Reddit:
human
[Mass Effect]How would the Citadel Council have reacted to a spacefaring culture that developed it's own equal or superior tech base completely independent of ME technology?
gpt
Your tech would be *ridiculously* valuable to the galaxy at large. That kind of outside context science and engineering could seriously disrupt the balance of power. 

So, the Asari would want to bring you in peacefully, probably shower you with technological aid in areas your deficient in, developmental, aid, preferential trade, etc.. They'd also try their darndest to make sure you only share your goodies with the Citadel Council races, and preferably only the Asari.

The Salarians would be similarly amenable, though it's entirely likely they would just try and steal whatever knowledge you have through use of the STG teams--and they would probably be pretty successful at it too.

The Turians would be stand-offish at best. Non-ME technology makes you a threat, and if there's one things Turians hate it's threats. They're... not big on curiosity. They'd try everything in their power to keep this theoretical power pushed into a corner and deprived of anything that could make them more powerful, while they devoted themselves to studying exactly how to crush it should it make the wrong move.

Humans? Well, humanity would probably put everything they have into becoming your very best friend, because tech like that would finally allow the Systems Alliance to not have to worry about cow-towing to the Council all the time. An Alliance with non-ME tech and a new best friend could probably become anew de facto power bloc (though they would probably remain nominally under Citadel control, they'd just politely ignore most of the directives coming down from the Council).