Clients that allow you to edit pages via Titan.
Rosy Crow for Android supports Titan!
Lagrange supports Titan! From the page context menu, pick "Copy page source", then "Upload with Titan", add the token if necessary, paste the text, make your edits, and save.
The Phoebe repository comes with a Perl script called “titan” to upload files.
Gemini Write is an extension for the Emacs Gopher and Gemini client.
Gemini & Titan are two Bash functions to download and upload files.
titan-upload.sh is a shell script for uploading files, supporting client certificates.