M4
Emulate Romboard, currently up to 16 roms, can be uploaded/removed via Web Interface.
Download files from internet via WiFi.
Mass storage to SD card, via native file I/O. R/W support. Emulated as drive A.
Can use DSK files on the SD card too, but only for file read access and sector reading via firmware call.
Upload files via web interface.

HxC Floppy Emulator
The Floppy emulator, an alternative to a floppy drive
The HxC floppy emulator designed by Jeff (Jean-Francois Del Nero) as an alternative way to load programs on the CPC.
The floppy emulator is an interface card that connects a PC directly to the floppy controller of the CPC.
The PC is connected to the HxC via a standard USB cable. A program is loaded on the PC that feeds the controller with disc information.

Gotek
Gotek is a floppy simulator which works with the CPC. The drives are cheap.
The basic Gotek has a 7-segment 2 digit display which shows the currently selected disk image, a USB socket for a USB memory stick, and 2 buttons to choose previous and next image.
There are additional mods that can be bought:
speaker (to simulate the sound of the read/write head stepping as heard in a real drive)
eject button
rotary dial (turn the dial to select the disc image)
LCD/OLED display (this shows more information including the name of the image)

Rombo Rombox
A ROM expansion board from Rombo Productions.
Technical
The rom board has 8 rom slots which can be individually enabled using the dipswitches. A link allows the roms to use the ids of 0-7 or 8-15.
0-7 is compatible with the firmware in the 464 which is limited to 8 roms. 0-7 or 8-15 is compatible with the firmware in the 6128 and Plus.
NOTE: Some 6128's may not support ROM 7 being overridden so if you use the range 0-7 then you should disable slot 7.
Testing was done by user nrgroom on his Rombo Rom board.
The I/O port used to select the rom (dfxx) is decoded partially and only checks A13=0 like other rom boards.
ROM ids are 8-bit and fully decoded. If range 8-15 is selected with the link then you see a rom in slot '0' in 8 only. It is not show in any other slots. I.e. it's not repeated.

MegaFlash
The MegaFlash is a ROMBoard similar to the MegaROM. It provides up to 32 virtual ROMs (Numbered 0 to 31) in a single 512K Flash ROM, but unlike the MegaROM, the MegaFlash can be populated directly from the CPC using TFMs MegaFlashROManager (available for Basic and FutureOS) or with Roman by Brueggi without the need for an EPROM Burner or any additional hardware. Other ROManagement software will currently not work with the MegaFlash.
Being based on Flash technology it also doesn't require a battery like other solutions did in the past. Unfortunately, due to complexity, the PCB design needs to be double-sided, making this project a little more difficult for hobbiests to build than the MegaROM was.
The complete hardware of the MegaFlash was developed by Bryce and released in August 2011.
If you have any further questions regarding this project contact Bryce through the Wiki Forum.

X-MEM
is a 512KB RAM and 512KB ROM Expansion made by TotO from ACME. Realeased on March 2014. It can be paired with a Y-MEM to expand the CPC to 1MB RAM and 1MB ROM.

Y-MEM
expansion made by TotO from ACME is a similar expansion as the X-MEM. The difference is the addressing of RAM and ROM
While the X-MEM addresses the lower ROM, ROMs 0-6 and 8-31, the Y-MEM addresses the ROMs from 32 to 63.
The X-MEM allows to access 512 KB RAM using the port &7Fxx. But the Y-MEM addresses another 512 KB using the port &7Exx.
Using the X-MEM and the Y-MEM together provides 1 MB of expansion RAM and 1 MB of Flash-ROM for the CPC or Plus computers.

CPC SYMBiFACE II
provides one solution for connecting a CPC with an IDE hard disc. You can use a master and a slave device.
Supports IDE hard discs with up to 128 GB.
Bigger HDD or CD/DVD drive support possible with drivers.
Simultaneous operation of two hard discs (master and slave) for a total of up to 256 GB on your CPC!
Transfer speed of 162 KByte/s. That's as fast as copying memory inside the CPC with LDIR. In practice (loading FAT16/32 files) the speed is still about 130 KB/s (SymbOS-FAT-driver).
External power supply provided: no extra load for the CPC's internal PSU.
No timing problems: Interrupts don't need to be disabled during the data transfer with the hard disc. The hard disc can operate while you play sound or doing other things with your CPC (multitasking etc.).
Traffic activity display via a LED on the board.
512 KB RAM extension, which is fully compatible with the CPC 6128 and the dk'tronics RAM extension
512 KB rewriteable ROM. You can upload up to 32 ROMs, which are persistent. You can also use the ROM space as an additional RAM extension. ROMs can be switched on or off via switches or via software.
PS/2 mouse connector. This makes it possible to connect wireless and optical mice (PC compatible, therefore inexpensive) to your CPC.
Real time clock, which is fully PC compatible and (as seen on the photo) provides additional 128 byte persistent RAM, which can be used to store config data.