Xcode 3.2 Release was released on 26 Aug 2009 and requires macOS 10.6+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/xcode_3.2/xcode3210a432.dmg.
Release notes are located at https://download.developer.apple.com/Developer_Tools/xcode_3.2/about_xcode_3.2.pdf.
The SDKs it contains are:
- macOS 10.4
- macOS 10.5
- macOS 10.6
The compilers it contains are:
- LLVM-GCC (Build 2118)
- GCC 4.0 (Build 5493)
- GCC 4.2 (Build 5646)