List of Textpattern plugins I’ve found helpful in my own sites.
(to avoid the obvious conflict of interest, I’ve refrained from including my own plugins)
Caching makes Textpattern one of the fastest CMSs available, yet again (it was fast before caching too!).
Simple improvement to the comment submission Textile formatting. Syntax is still easy to mess up for first time posters, but this makes it a lot easier to use the basic *bold*, _italic_, link and image formats.
Template system for saving and loading groups of Textpattern pages, forms, and styles. Very nicely setup, and even if it’s not used for switching site designs, it makes for an easy backup utility!
Easily filters out spam by keyword and/or number of links present in the message. Switching to pop-up comment submission forms can eliminate spam, but in the off chance you don’t, this plugin will help.
Manages the Textpattern database, including repairs, backups, and MySQL commands. This is probably the first plugin I install whenever starting a new Textpattern site. Rob Sable has written a lot of other plugins, and I highly recommend checking out his other offerings.
Using cookies set from the Textpattern admin interface, this allows you to insert an article edit link visible only to yourself. It makes quickly editing posted articles far easier.
Allows you to use the tab key within Textpattern text fields. Finally, code editing can use tabs instead of spaces! The author has released many other useful plugins, such as upm_plugin_restore.
Similar to asy_jpcache listed above, just different. Not an official plugin, unfortunately, and Zem has up and left Textpattern (he’s been hired by the Wordpress team). The latest version I’ve seen was 0.5
Online email form, easily customized, and reasonably integrated.
The only “pro” plugin I’ve ever come across, meaning you have to pay for it. It sets up automatic redirection if you change URL styles or the section an article is published in, and allows manual redirection of various types. If you play it smart and don’t mess with your URL settings or section organization, you shouldn’t need this.