For my primary Gemini client, I use Lagrange with a fontpack I made containing the Jost* font.
Jost is a modernist font reminescent of Futura, designed by Indestructible Type. Previous to Lagrange 1.8.0, which introduced support for user-supplied fonts via fontpacks, I'd been replacing Nunito's TrueType files with Jost's prior to each build.
I use makeworld's gemget for my Gemini scripting needs. Sure, I could just cobble together netcat and OpenSSL to achieve the same thing, but... well, I haven't. Maybe someday.
For reading tinylog posts, I use bacardi55's gtl. It provides a TUI interface and has support for posting built-in, which I've not used yet.