Well, I don't know about a list, but I can tell you that we started FLL and WWE when they were capable. FLL 1 was done orally and generally done around 5 yo. WWE was done in first grade. Sometimes orally - just depended on the kid and time. I skipped the copywork (and if there was dictation) suggested in FLL because there was a lot of copywork in WWE.
We didn't do OPGTR.
For readers at that age I used the following:
American Language Readers Set
Nora Gaydos books (may be out of print)
You read to me, then I'll read to you series
Elephant and Piggie series
tons of stuff from the library
Hth!