The Lost Age
Golden Sun: The Lost Age is still being decompiled.
The Lost Age is still being decompiled. About a third of its code is C so far, and nearly all of its data is placed from source; the README has the current figures.
Its pages will come here once it is done. Until then its work in progress is on GitHub: the C in games/tla, and the drafts of the functions still being matched in recon/tla.
Much of The Lost Age's engine is The Broken Seal's, so The Broken Seal's guides describe most of it already.