@amigadave
PortablE was written in Amiga-E and then gradually ported to PortableE, which means it is now capable of compiling itself. That is how he can support so many platforms now.
@trekiej
Most of my programs are written in E:
CodeAudio (formerly TheMpegEncGUI)
MultiRen
Detris
DRemind
JoinSplitter
...
Pretty much everything that says OS3/68k on onyxsoft.se is written in E.
For OS4 I've written DeeJayD (still alpha) and SpeakerRangeTester in PortableE.