Algebraic Topology by Allan Hatcher
Spectral Sequences in Algebraic Topology by Allan Hatcher
Basic Topology of 3-Manifolds by Allan Hatcher
The Geometry and Topology of Three-Manifolds by William P. Thurston
Textbook in Problems on Elementary Topology by by O.Ya.Viro, O.A.Ivanov, V.M.Kharlamov and N.Y.Netsvetaev
Algebraic Topology by Solomon Lefschetz
Course Notes
Topology Course Lecture Notes by Aisling McCluskey and Brian McMaster
An Introduction to the Theory of Numbers by Leo Moser
Elementary Number Theory by W. Edwin Clark (PostScript)
Algebra and Number Theory by Andrew Baker
An Introduction to p-adic Numbers and p-adic Analysis by Andrew Baker
A Course In Algebraic Number Theory by Robert B. Ash
Numbers and Curves by Franz Lemmermeyer
An Introduction to Number Theory by Franz Lemmermeyer
A Computational Introduction to Number Theory and Algebra by Victor Shoup
Course Notes
Elementary Number Theory Course Notes by Michael Filaseta
Introductory Notes to Algebraic Number Theory by Ivan Fesenko
While downloading these books and course notes, I would like to warn you that the books and course notes are free under the conditions set by the authors, so please be aware about the conditions.
Also note that almost all the books and course notes are .pdf files.