Aeschylus:
The Persians
Seven Against Thebes
The Suppliants
The Oresteia (Agamemnon, The Libation Bearers, The Eumenides)
Prometheus Bound (authorship unknown, previously thought to be Aeschylus)
Sophocles:
The Theban Plays (Oedipus Rex, Oedipus at Colonnus, Antigone)
Ajax
The Trachinae
Electra
Philoctetes
Euripides:
Alcestis
Medea
Hecuba
Heracleidae
Hippolytus
Andromache
The Suppliants
Electra
Heracles
Trojan Women
Iphigeneia in Tauris
Ion
Helen
Orestes
Phoenician Women
Bacchae
Iphigeneia at Aulis
I own quite a few of these but I still have a lot to go. I feel like I’ve read a few more, but I can’t quite remember which ones. Iphigenia in Tauris, maybe? And whose Electra have I read?
