There are some questions on mathoverflow such as
with answers that tell us things such as:
Mathematicians prefer to use older books because of some old books are full of amazing ideas and some of them are comprehensive (such as books of Spivak).
Question: What older books (with low quality typesetting) would you like to see reprinted with high quality typesetting?
My question is not just a question. We are a group of math students (most of them are geometry students) that want to re-write popular old books using $\mathrm{\LaTeX}$.
One can search for most cited books such as: Curvature and Betti numbers (K Yano, S Bochner) or Einstein manifolds (AL Besse).
Update: We have some rules:
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After sending $\LaTeX$ and PDF file of rewritten books to main author or publisher, we delete it from our computer.
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We never publish it anywhere on internet (If publisher or author give an answer for re-typing).
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We don't want to earn money by selling these books (If publisher or author didn't accept to pay for our work we have no way but creating a donation page after author or publisher approval).
Note: See books in progress on my blog and encourage us by making a donation.
Update (April 30 2019): It would be great appreciate if you inform me about any grant that support this project.
Best Answer
Morse Theory by Milnor (and Spivak and Wells)
$\color{blue}{\text{Typesetting of this book has been finished}}$. Read it online here