Yep, it'll be a big listbox with Char1, Char2, and the Kern value. With some buttons to add/remove rows. Only need to find the time...

Joe Strout: Nice job! Looks promising.
The kerning feature wouldn't be that hard to add, would it? - input box for two characters, perhaps a convenient keyboard shortcut for expanding and contracting the shift, maybe some visualisation of the distance...
Once it's done I'd be happy to add the link among the tools into the ?page=support section.

Here's a screen shot of my conversion tool so far. Still need to add kern support (it currently can calculating kerning, but gives you no way to edit it).

https://imgur.com/a/ASeecF7

@admin: sorry for the late reply... conversion from TTF is still important to me. BMF is the only font support in Mini Micro, and people sometimes want to just draw nice readable text, using Noto Sans or whatever.

I'll see about cleaning up my converter tool and releasing it somewhere, and I guess I'll go ahead and include conversion to/from this AngelCode BMFont format too. I'll be sure to let you know when it's posted (but it may be a while -- got too many irons in the fire right now!).

@Joe: The first line on their site says "This program will allow you to generate bitmap fonts from TrueType fonts." So there - really not much of a common denominator.
Though there are some ?tag=ttf fonts in collection here from the past, I think I am actually against adding other vector fonts here now. Those two worlds (of pixelated and vector graphics) have little in common, imo.
There is a library and an editor I wrote in Lazarus, as
of tools there's https://github.com/crs2/Bmf/blob/develop/ttf2png.php and https://bmf.php5.cz/img2bmf.php

I've recently become aware of the "BMFont" format, popularized by AngelCode.com (http://www.angelcode.com/products/bmfont/). It seems to be essentially the same as BMF, except that it uses two files: a PNG file for the glyph data, and a separate text file with the metadata. That's two files to keep track of instead of one, but it has the advantage that you can easily look at the PNG file for a preview of the font.

Any thoughts about how these two formats relate? Are there conversion tools from one to the other? Finally, one reason I've heard that people like BMFont is that there is a nice (Windows) tool for creating them from TrueType fonts -- do we have such a tool for BMF? (Except for mine, which I have not released?)

Thanks a lot for the super quick update on the UI.
Soooo much better now.

@Oliver: I added this project to the ?page=support.

I have finished a bmf2bdf converter:
Features
- Convert .bmf to .bdf
- Converts DOS codepage to Unicode (-u option)
- Convert monospaced proportional font back to none-monospaced font (-p)
- Optional glyph spacing with -x
- Optional baseline adjustment with -y
- Brightness threshold with -l for multicolor fonts
- Generated BDF can be modified with gbdfed and FontForge
URL: https://github.com/olikraus/u8g2/tree/master/tools/font/bmf2bdf
The converter is a single .c file without other dependencies. Windows exe is included in the above folder.

Let me add some generic notes from my tests with the bmf2bdf converter:
1) Some fonts are marked as monospaced, but are actually proportional fonts.
2) The baseline seems to be shifted for some fonts (ok, it depends on the definition of baseline). But the problem is: The above bdf converter can't fix this: If the uppercase A is not placed on the baseline, then this is also not the case for the generated BDF.

Again, thanks for the effort and improvements for the filter.

@Oliver, @Joe: Allright, I hear ya. Did some changes to address this, added inputs to filter the number of colors and characters in the font. Yeah, the number of characters is not exactly the same as filtering whether the font has a lower case letters, I hope it'll be good enough for now, though.
Btw. you can still sort the search result by the number of colors in the font, as well as the number of characters in it. Also, you can filter just the fonts with ?tag=incomplete-alphabet.