Zapzilla

Zapzilla is the nickname of the Teletext browser built into Zapping. Here's a quick overview of its features:

Zapzilla implements the European Teletext standard (Teletext System B, EN 300 706).
It can display Teletext Level 1/1.5/2.5/3.5 ("HiText") pages with 4096 colors, graphics, bold and italic characters, double width and/or height characters, concealed and flashing text.
All Teletext character sets are supported, for example Turkish, Russian, Greek, Hebrew and Arabic. Users can override the character encoding, which isn't always correctly transmitted, and the selected encoding is saved across sessions.
Zapzilla can show different pages in multiple windows. The main window can also display Teletext instead of video, either in a window, full-screen or as desktop background.
The text brightness and contrast are adjustable.
Zapzilla does not support custom fonts yet, but Teletext windows can assume any size and the page is scaled accordingly.
Teletext pages can be overlaid onto video, e.g. subtitles, news flashes, or interactive pages.
All displayed pages update in real time, for example the clock and "rolling" page number in the header.
To change pages users can enter a page number, press cursor keys or click on toolbar buttons. Remote controls are also supported.
Clicking on a page or subpage number in the text opens the page in the same or a new window. Like web browsers, Teletext windows have a forward, back and home button.
Clicking on a URL in the text opens the page in a web browser. E-mail addresses open an e-mail client.
TOP and FLOF navigation is supported. The TOP page index appears in a drop-down menu. TOP and FLOF links can be clicked on like page numbers. All pages of a channel are stored in memory for instant access.
The Teletext cache can store pages of multiple channels to reduce wait times and to view pages of another channel than the one currently tuned in. The amount of memory consumed by Zapzilla is user definable.
Users can search the Teletext cache, optionally using Unicode regular expressions. Currently this works with all character sets except Hebrew and Arabic, and on mixed language pages.
Pages can be saved in HTML, PNG, PPM, and VTX format, or as plain text with or without colors.
Users can mark text with the pointer and copy it into other applications, as text or image, with a middle mouse button click (drag & drop) or by pasting from the clipboard. Flowing (as in a web browser) and tabular text selection is possible.
Pages can be bookmarked.

Screenshots

If you're not utterly impressed by now, here are the carefully crafted screenshots you've been waiting for. Note they were taken from version 0.6. The user interface changed completely in the meantime and I'm too busy to update this page. Donations welcome.

OK, many things:

There are three Teletext windows here, one of them is the Zapping main window acting as a Teletext viewer. You can see the graphics in the page. Note the arbitrary scaling, each Teletext page has a different size. The open dialog lets you export a page to the previously mentioned formats, here to an HTML page.

Apparently nothing special here, just Galeon and Zapzilla... until your neuronal network sees the pattern: "Perhaps the URL in Galeon has been opened by clicking on the link that appears in the Teletext page?". You are completely right, so I don't need to explain anything. I will just tell that email adresses and page numbers are clickable too. The cryptic message in the bottom row is part of the TOP navigation, also hyperlinks.

Zapzilla supports searching for regular expressions in the page memory. I gave the #email# pattern to search for, the highlight text is the second match. The window in the back is the help window that appears when you click the "Help" button. And in case you are wondering, "#email#" isn't a regular expression, it's just a convenient alias I added that expands into one horrific expression like "([:alnum:]|[-~.]+@([:alnum:]|[-~.])+)". Basically it matches email adresses. Similarly you can use the "#url#" alias to match WWW addresses.

This isn't properly Zapzilla, but the subtitle overlay built into Zapping in concert with the Closed Caption decoder built into libzvbi. Teletext subtitles are supported in the same way.