From TextMate Wiki

Main: TextMateAwarePrograms

This is a list of programs which use the ODB Editor Suite (or a similar mechanism) and status to whether or not they support TextMate:

FTP:

Support TM, possibly through an "Other…" choice:

• Transmit

• Interarchy

• Cyberduck

• Yummy FTP

• Fetch

• FTPeel

• Captain FTP

• Fugu

• Flow

• MacSFTP: supports TextMate (not in the UI, but if you specify TextMate as the program to handle the "ftp-editor" protocol)

Support unconfirmed:

• CuteFTP

• Vicomsoft FTP

Web Browsers:

• Safari, or any WebKit browser (Shiira, OmniWeb, etc.): Use the "Edit in TextMate…" input manager

• Firefox: TM can be set up as text field editor, see the the how-to page.

• Opera: supports TM through Preferences > Programms and paths > Source Viewer.

Other:

ecto

supports TM

Graphviz

supports TM if you choose it the first time you start it or if you alter it later in "Library/Preferences/com.pixelglow.graphviz.gui.plist".

Locomotive

has TM support. Menu->Rails->Edit in TextMate

MarsEdit

has TM support

NetFinder

Supports TM, select “Other” as Editor and enter TxMt in the text field.

odbedit

is a command line program, like mate, that can open a file in Textmate (although the prefs are very primitive at the moment). It can call other command line programs when the file being edited is saved or closed. The Remote Edit scripts use odbedit to give TextMate scp integration.

osXigen

?

PDFView

supports TM, see http://pdfview.sourceforge.net/latex.html for details

Pipe

writes, auto-runs and stores scripts in bash, tsh, perl, python, etc. Supports TM as the editor.

RBrowser

supports TM

svnX

You can invoke svnX from TextMate and be presented with a window with the different revisions of the edited file.

VoodooPad

Version 2.1 and +. If you want to use TM as external editor. Type this in terminal:

- should I bother mentioning Xcode? can set it up throught the prefs

MacSpice

MacSpice is capable of using TextMate as an external editor.

Teambase

Teambase supports TextMate, allowing users to open, save, and close documents in its database. Teambase is an archive management system for print and web publishers.

If you write the author of one of these programs, or know of more programs, add to the list and keep a status on what actions are planned by the author(s) of that program.

The unofficial specs for The External Editor Protocol say that applications should check the helper*ftp-editor and helper*editor keys in the Internet Config database before defaulting to BBEdit. I've added these keys and it doesn't work in Transmit, but maybe it could work in another app?

Internet Config database sounds very legacy, as in, Mac Classic.