Free textbooks in topology
- Textbook in Problems on Elementary Topology by O.Ya.Viro, O.A.Ivanov, V.M.Kharlamov and N.Y.Netsvetaev unfinished
- Topology Course Lecture Notes by Aisling McCluskey and Brian McMaster
- Topology lecture notes(3rd year) by Thomas Ward
- Allen Hatcher's homepage has a (nearly complete) textbook.
- Cohomology, Connections, Curvature and Characteristic Classes by David Mond
- Introduction to Characteritic Classes and Index Theory by Jean-Pierre Schneiders
- Algebraic Topology by Allen Hatcher.
- Algebraic Topology by Solomon Lefschetz, AMS 1942, 389 pp.
- Abstract group theory and topology articles by Walter Neumann