Please note that information provided here may not be 100% complete. Read about the boards' details on the websites provided, or get in contact with the developers, if in doubt.
Have fun choosing your next-gen Amiga accelerator!
ACA500plusIndividual Computers brings us this accelerator board for the Amiga 500, with some interesting features - like e.g. built in Kickstart ROMs, AmigaOS 3.1 installer software, and a connector for A1200 accelerators.
CPU: MC68EC000 at 14 to 42MHz
two CF-card slots
Action Replay-compatible freezer
7-segment display "DisMo"
Kickstart V1.2, V1.3 and V3.1, and AmigaOS 3.1 installer in FlashROM
Extension connectors: A1200-compatible Clockport, local 16-Bit extension port, connector for A1200 accelerators
ACA1221ecIndividual Computers' low-budget accelerator for the Amiga 1200, sells for only about 120 Euros.
17 to 42 MHz
16MB RAM, 9MB of which are usable FastRAM
2 clockports, one of which is hi-speed (for RapidRoad USB host controller use)
ACA1233n-40 and ACA1233-55
Individual Computers' 68030 accelerators are still available.
Furia EC020 for Amiga 600On sale for quite some time now are the Furia accelerators for the Amiga 600, available via online stores (e.g. http://vesalia.de or http://lotharek.pl )
CPU: 68EC020 at 33MHz
FPU: 68882 (if present)
TerribleFire TF520, TF530, and TF540Stephen Leary's open-source DIY accelerators for the Amiga 500. Documentation on how to build the 68020 and 68030 CPU versions (TF520, TF530) are already available via GitHub and YouTube (see links below), and just recently Stephen has begun developing the 68040 version (TF540).
CPU: 68020, 68030, or 68040
Here's a demo of the TF530 in action, comparing a stock A500's performance to that of a TF530-equipped one, using "Frontier - Elite II":
Wicher 500iAccelerator board for the Amiga 500, from Poland.
Max. clock: 50MHz
RAM: 1-8 MB SIMM 72 (FPM,EDO)
Here you can see it in action:
There's also a Wicher 2000 accelerator board for the Amiga 2000 planned.
HC508Homebrew accelerator for the Amiga 500 by blogspot/YouTube user "m68k". Not much is known about this one, especially if it'll be sold to the public or made open-source one day.
68HC000 CPU at 50 MHz, 100% MC68000 compatible
IDE-controller (40-pin) for HD and CD-ROM
integrated CF-Card slot
8 MB FastRAM (1 wait state)
512k FlashROM for Kickstart (1 wait state)
Utility to individually (de)activate any module (CPU, RAM, ROM, IDE)
Here you can see it in action:
Vampire 500 V2 and Vampire 600 V2FPGA-based accelerators - and much more - for the Amiga 500 and 600. Amiga 1200 version is in development. CPU performance far beyond that of a 68060, SAGA graphics with Full-HD resolution, HDMI output, 128MB RAM, MicroSD card slot, IDE controller (Vampire 500 only). The ultimate boost in performance!
phase 5 BlizzardPPC 2PowerPC accelerator for the Amiga 1200. Not much is known about this new beast from phase 5, only a few pictures have been posted to their facebook-page. But as far as one can tell from their announcements, they're seriously getting back into business.
phase 5 AmigaONE-1200 II board with G4 CPUExtension board for Amiga 1200 tower conversions (see previous post), with G3/G4 PPC CPU slot. As with the BlizzardPPC 2, not much is known, and there are currently only some pictures they posted to their facebook-page. But just imagine your Amiga 1200 driven by a G4 CPU...
UPDATE Jan. 27rd 2018:
Please keep in mind that especially due to recent events the information provided by phase 5 digital products is highly controversial. You are strongly advised to do research before placing an order. We are still hoping all issues can be resolved. I am in no way affiliated with Salvador Fernandez Gomez or phase 5 digital products.