Here are some of the ones which have informed my thinking.
Mooers' law - "An information retrieval system will tend not to be used whenever it is more painful and troublesome for a customer to have information than for him not to have it."
Derek Price's "exponential curve of science". This of course is connected to a number of exponential growth laws, including Moore's Law and Engelbart's Law ("The intrinsic rate of human performance is exponential."). On the other hand, Bradford's Law ("the exponentially diminishing returns of extending a library search.").
If you have Fitt's law then you should have Hick's law and Miller's law, as they are often mentioned in UX contexts.
A classic adage is "Fast, Good or Cheap. Pick two." (The followup is for aerospace - "Pick one. And it can't be cheap.")
A related one comes from the early Unix work. The earliest citation I know is from Stephen C. Johnson and Brian W. Kernighan - "the strategy is definitely: first make it work, then make it right, and, finally, make it fast". http://wiki.c2.com/?MakeItWorkMakeItRightMakeItFast
Brandolini's law - "The amount of energy needed to refute bullshit is an order of magnitude bigger than to produce it."
Brooks's law - "Adding manpower to a late software project makes it later."
Conway's law - "Any piece of software reflects the organizational structure that produced it."
Deutsch limit - "The problem with visual programming is that you can’t have more than 50 visual primitives on the screen at the same time."
C.A.R. Hoare - "There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies, and the other way is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult."
Gerald Weinberg - "The human eye has an almost infinite capacity for not seeing what it does not want to see.... Programmers, if left to their own devices, will ignore the most glaring errors in their output -- errors that anyone else can see in an instant."
Regarding "Talent imitates, genius steals". See https://quoteinvestigator.com/2013/03/06/artists-steal/ for some history on that family of quotations.
Regarding "You can't improve what you don't measure", see https://blog.deming.org/2013/08/unknown-and-unknowable-data/ : "Ironically, people often quote Dr. Deming as saying something along the lines of: “you can’t management what you can’t measure.” Not only did he not believe this, he thought managing as though it were true was a deadly disease of management." The link to Fowler's essay is that you "Cannot Measure Productivity" and adds that the aphorism is a cop out.