What are some good undergraduate level books, particularly good introductions to (Real and Complex) Analysis, Linear Algebra, Algebra or Differential/Integral Equations (but books in any undergraduate level topic would also be much appreciated)?

EDIT: More topics (Affine, Euclidian, Hyperbolic, Descriptive & Diferential Geometry, Probability and Statistics, Numerical Mathematics, Distributions and Partial Equations, Topology, Algebraic Topology, Mathematical Logic etc)

Please post only one book per answer so that people can easily vote the books up/down and we get a nice sorted list. If possible post a link to the book itself (if it is freely available online) or to its amazon or google books page.

Hi, I realize this question is probably against the FAQ rules and not appropriate for MathOverflow but I'm gonna ask it anyway and then you

What are free to bury or ignore it or whatever...

I was wondering if anybody could suggest some good college undergraduate level books, particularly those that are introductory good introductions to college level Analysis, Linear Algebra, Analytic Geometry, Affine Geometry, Algebra or Differential/Integral Equations , (but books in any college undergraduate level topic would also be much appreciated..appreciated)?

Please post only one book per answer so that people can easily vote the books up/down and we get a nice sorted list.

Also if If possible , whenever you mention post a book in your questions and answers could you label it with "book" and if link to the book itself (if it is freely available onlineand linked within your question/answer with "free-book"? ...and then people could fish for math goodies when they click the tags..) or to its amazon or google books page.

Hi, I realize this question is probably against the FAQ rules and not appropriate for MathOverflow but I'm gonna ask it anyway and then you are free to bury or ignore it or whatever...

I was wondering if anybody could suggest some good college level books, particularly those that are introductory to college level Analysis, Linear Algebra, Analytic Geometry, Affine Geometry, Algebra or Differential/Integral Equations, but books in any college level topic would also be much appreciated...

Also if possible, whenever you mention a book in your questions and answers could you label it with "book" and if the book is freely available online and linked within your question/answer with "free-book"? ...and then people could fish for math goodies when they click the tags...