For Windows you might have a look at SPFLite.
Nowadays quite a restriction: it's not really unicode-capable
For Windows you might have a look at SPFLite.
Then again, if you want to get back into it, there's a full working copy of the z/OS 1.11 ADCD on archive.org, and the torrent for z/OS 1.10 (which I've been using since 2009) is still around, and compared to the real ISPF editor, SPFLite is, well let's be friendly, very, very lite...