Full changes: Oangband 0.6.2b - Oangband 0.7.0
Full changes: Oangband 0.6.2 - Oangband 0.6.2b
Full changes: Oangband 0.6.1 - Oangband 0.6.2
Full changes: Oangband 0.6.0 - Oangband 0.6.1

Full changes: Oangband 0.5.2 - Oangband 0.6.0
Specialty abilities added in Oangband 0.6.0
Monster traps added in Oangband 0.6.0

Full changes: Oangband 0.5.1b - Oangband 0.5.2
Full changes: Oangband 0.5.0b - Oangband 0.5.1
Full changes: Oangband 0.4.1 - Oangband 0.5.0b
Full changes: Oangband 0.4.0e - Oangband 0.4.1
Full changes: Oangband 0.3.2 - Oangband 0.4.0b
Full changes: Oangband 0.3.1 - Oangband 0.3.2
Full changes: Oangband 0.3.0 - Oangband 0.3.1
Full changes: Oangband 0.2.0 - Oangband 0.3.0
Full changes: Oangband 0.1.0 - Oangband 0.2.0
Full changes: Angband 2.8.3 - Oangband 0.1.0

Oangband changes in a nutshell

Source code guides:

Guide to Angband 2.8.3 Source Code
Guide to Oangband Source Code