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Lecture Notes in General Topology
This note explains the following topics: Continuity, Infinite product spaces, Connectedness and compactness, Tychonoff’s theorem, Compactnesses, Countability and separation axioms, Urysohn’s lemma, Urysohn’s metrisation theorem, Baire category theorem, Quotient spaces and topological groups, Homotopy theory, Covering spaces, Brouwer fixed-point theorem.
Author(s): Dr Sheng-Chi Liu
89 Pages 
Lecture notes on Topology by Huynh Quang Vu
This note covers general topology, Geometric topology and differential topology.
Author(s): Huynh Quang Vu
118 Pages
General Topology by Paul Souverains
This note covers topological spaces, Continuous functions, Compact topological spaces, Compact metric spaces, Separability axioms and theorems, Metrizations.
Author(s): Paul Souverains
323 Pages
Introduction to Topology by Alex Kuronya
This note covers Basic concepts, Constructing topologies, Connectedness, Separation axioms and the Hausdorff property, Compactness and its relatives, Quotient spaces, Homotopy, The fundamental group and some applications, Covering spaces and Classification of covering spaces.
Author(s): Alex Kuronya
102 Pages
General Topology by Tom Leinster
This note covers the following topics: Topological spaces, metric spaces, Topological properties, Subspaces, Compactness, Compact metric spaces, Connectedness, Connected subsets of the real line.
Author(s): Tom Leinster
85 Pages