The following list is not meant to be an exhaustive list of papers on the given topic.
Homeomorphism, h/s-cobordism and homotopy classifications:
Boyer: Simply-connected 4-manifolds with a given boundary.
Boyer: Realisation of 4-manifolds with a given boundary.
Davis-Hillman: Aspherical 4-manifolds with elementary amenable fundamental group.
Hambleton-Kreck: On the classification of topological 4-manifolds with finite fundamental group (1/3).
Hambleton-Kreck-Teichner: Nonorientable 4-manifolds with fundamental group of order 2.
Hambleton-Kreck-Teichner Topological 4-manifolds with geometrically 2-dimensional fundamental groups.
Hillman, Kasprowski, Powell, Ray: Homotopy classification of 4-manifolds with 3-manifold fundamental group.
Kasprowski-Land: Topological 4-manifolds with 4-dimensional fundamental group.
Stong: Simply-connected 4-manifolds with a given boundary.
Stable classifications:
Davis: The Borel/Novikov conjectures and stable diffeomorphisms of 4-manifolds.
Kasprowski-Land-Powell-Teichner: Stable classification of 4-manifolds with 3-manifold fundamental groups.
Kasprowski-Nicholson-Vesela: Stable equivalence relations on 4-manifolds.
Kasprowski-Powell-Teichner: Algebraic criteria for stable diffeomorphism of spin 4-manifolds.
Kasprowski-Powell-Teichner: The Kervaire-Milnor invariant in the stable classification of spin 4-manifolds.
Teichner: Topological 4-manifolds with finite fundamental group.
Classifications of connected surfaces in 4-manifolds:
Baykur-Sunukjian: Knotted surfaces in 4-manifolds and stabilizations.
Daher-Powell Smoothing 3-manifolds in 5-manifolds.
Feller-Miller-Nagel-Orson-Powell-Ray: Embedding spheres in knot traces.
Friedl-Teichner: New topologically slice knots.
Lee-Wilczynski: Locally flat 2-spheres in simply connected 4-manifolds.
Lee-Wilczynski: Representing Homology Classes by Locally Flat 2-Spheres.
Lee-Wilczynski: Representing Homology Classes by Locally Flat Surfaces of Minimum Genus.
Klug-Miller: Concordance of spheres in 4-manifolds with an immersed dual spheres.
Orson-Powell: Simple spines of homotopy 2-spheres are unique.
Schneiderman-Teichner: Homotopy versus isotopy: spheres with duals in 4-manifolds.
Homeomorphism groups and mapping class groups:
Galvin: The Casson-Sullivan invariant for homeomorphisms of 4-manifolds.
Galvin-Nonino: Pseudo-isotopy versus isotopy for homeomorphisms of 4-manifolds.
Orson-Powell: Mapping class groups of simply connected 4-manifolds with boundary.
Orson-Powell Randall-Williams: Smoothing topological pseudo-isotopies of 4-manifolds.
Powell: Symmetries of 4-manifolds || Warsaw lectures.
Singh: Pseudo-isotopies and diffeomorphisms of 4-manifolds.
Stong-Wang: Self-homeomorphisms of 4-manifolds with fundamental group Z.
Locally linear group actions:
Chen: Section 1 of Group actions on 4-manifolds: some recent results and open questions.
Edmonds: Construction of Group Actions of Four-Manifolds.
Kwasik-Vogel: Asymmetric four-dimensional manifolds.
Kwasik: On the symmetries of fake CP^2.
Wilczynski: Periodic maps on simply connected four-manifolds.
Wilczynski: On the topological classification of pseudofree group actions on 4-manifolds. I.
The surgery conjecture.
Cha-Kim-Powell: A family of freely slice good boundary links.
Freedman-Teichner: 4-Manifold topology I- Subexponential groups.
Kim-Orson-Park-Ray: Chapter 23 of the book "The disc embedding theorem".
Krushkal: A counterexample to the strong version of Freedman’s conjecture.
Krushkal: Surfaces in 4-manifolds and the surgery conjecture.
Krushkal-Quinn: Subexponential groups in 4–manifold topology.