Habla seems to be popular. Think of those clients as a substack account that automatically self-promotes across all cleints..

https://primal.net/myarticles

Thanks for the info primals

https://yakihonne.com/ offers a combination of long text format and short messages.

nevent1qqswvty5l9fas25cchjcvv4k797htrscq7f24am0qjf48wy4npnzfkgpzemhxue69uhhyetvv9ujuurjd9kkzmpwdejhg5zz2j4

As with most things on Nostr, there's more than one way to get it done. Primal has their new long-form composition tool that nostr:npub18ams6ewn5aj2n3wt2qawzglx9mr4nzksxhvrdc4gzrecw7n5tvjqctp424 and nostr:npub1spdnfacgsd7lk0nlqkq443tkq4jx9z6c6ksvaquuewmw7d3qltpslcq6j7 mentioned. I am a big fan of ...

I've used a couple different things. They each have their pros and cons. Right now I mostly use highligher.com