One of the first SiN level editors, it has a bunch of features and is based on QE4. Sinister has full support for SiN and takes advantage of all of the SiN features.
Peter Zhou
Speednet Group
Cristiano Leoni
First Productions, Inc.
kydsoft Inc
Mark Balthazor
LoRDRaT
BugMaker Software
DivX, Inc.
Andrea Tincani
s.stenton
AxpertSoft
DownloadToolz, Inc.
Quick PST to NSF
ByteScout
Bustalinnie Software
Anita Kingston