My Kobo H2O modifications:

- AutoPatch -

Perform patches directly on the Kobo. Beta stage. Unfinished.
http://www.mobileread.com/forums/showthread.php?t=253265

- AutoShelf -

Create collections for each folder directly on the Kobo.
http://www.mobileread.com/forums/showthread.php?t=254554

- FlashCard -

Study flashcard / spaced repetition while you read.
https://www.mobileread.com/forums/showthread.php?t=311894

- HyphenDicts -

Move all hyphenation dictionaries to USB storage /.addons/hyphendicts/ for editing.
http://www.mobileread.com/forums/showthread.php?t=266005

- MagicMemory - 

Upgrade/Replace the Kobo's internal SD card on the fly.
http://www.mobileread.com/forums/showthread.php?t=261578

- MiniClock -

Display current date/time on screen.
https://www.mobileread.com/forums/showthread.php?p=3762123#post3762123

- NickelIcons -

Modify PNG images embedded in the nickel binary.
http://www.mobileread.com/forums/showthread.php?t=262837

- ScreenSaver -

Display a random screensaver PNG image on standby/poweroff.
http://www.mobileread.com/forums/showthread.php?t=255238

- TelnetFtp -

Enable telnet and ftp servers. Survives most firmware updates.

- UsbDebug -

Show whether user partition was properly umounted for USB export.
http://www.mobileread.com/forums/showthread.php?t=263674

- WebPortal - 

A local web server running on the Kobo and the things you can do with it.
Also includes a hack that allows intranet wifi usage (without WWW access).
http://www.mobileread.com/forums/showthread.php?t=262353

- ext234vfat -

Add support for ext2/3/4 filesystems for USB and SD storage.
http://www.mobileread.com/forums/showthread.php?p=3003110#post3003110

- fatpatch -

Kobo <-> Win10 compatibility hack.
http://www.mobileread.com/forums/showthread.php?p=3367786#post3367786

- pngshow -

A program that draws PNG image data on the display, regardless of rotation.
DISCONTINUED: Use https://github.com/NiLuJe/FBInk instead.