The Optware package system now runs on a large number of systems, not just the NSLU2. Below is a summary of the supported platforms.

Linksys NSLU2 (Slug)

Processor: Intel XScale-IXP425, 133MHz (266MHz with de-underclock)
Architecture: armeb
Memory: 32MB RAM, 8MB Flash
Interfaces: 100 Mbit Ethernet, 2 x USB 2.0

Feed for unslung firmware: nslu2
Kernel: 2.4.22, Libs: glibc-2.2.5
Current toolchain: armv5b-softfloat-linux/gcc-3.3.5-glibc-2.2.5
Project Page: http://www.nslu2-linux.org/wiki/Unslung/HomePage
Comments: The original platform and the only one that has any content in its native compiled as opposed to cross compiled feed.

Feed for openslug firmware: slugosbe
Kernel: 2.6.17, Libs: glibc-2.3.5
Current toolchain: armeb-linux/gcc-4.1.1
Project Page: http://www.nslu2-linux.org/wiki/OpenSlug/HomePage
Comments: Slugosbe

Feed for slugosle firmware: slugosle
Kernel: 2.6.17, Libs: glibc-2.5
Current toolchain: arm-linux/gcc-4.1.2
Project Page: http://www.nslu2-linux.org/wiki/SlugOS/HomePage
Comments: Slugosle

Feed for openwrt firmware: openwrt-ixp4xx
Kernel: 2.6, Libs: uclibc 0.9.28.2
Current toolchain: armeb_gcc4.1.2
Project Page: http://www.nslu2-linux.org/wiki/OpenWrt/HomePage

Asus WL-500G

Processor: BCM4702
Architecture: mipsel
Memory: 16MB RAM, 4MB Flash
Interfaces: Ethernet, 802.11G (WiFi), USB 1.1, SPP Parallel Port
Feed: wl500g
Kernel: 2.4.20, Libs: uClibc-0.9.19
Current toolchain: hndtools-mipsel-uclibc-3.2.3
Project Page: http://www.nslu2-linux.org/wiki/FAQ/OptwareWl500gBuild
Comments: Works also on WL-500G Deluxe (4MB Flash, 32MB RAM, USB 2.0), WL-500G Premium (8MB Flash, 32MB RAM, USB 2.0) and WL-HDD (4MB Flash, 16MB RAM, USB 1.1)

Mipsel uclibc based firmwares - oleg and ddwrt

Processor: Broadcom wireless processors BRCMxxxx
Architecture: mipsel
Memory: 32MB RAM, 4MB Flash
Interfaces: Ethernet, 802.11G (WiFi), USB 2.0,
Feed: oleg and ddwrt
Kernel: 2.4.20 and 2.4.33, Libs: uClibc-0.9.28 with patches
Current toolchain: gcc-4.1.1-uclibc-0.9.28
Project Page: http://www.nslu2-linux.org/wiki/FAQ/Optware-uClibcBuild
Comments: Works on all DD-WRT, X-Wrt, OpenWrt, Oleg, ..., firmwares if enough external storage provided

brcm24 OpenWrt build

Firmware: OpenWrt Kamikaze 7.09 and X-WRT Kamikaze
Processor: Broadcom wireless processors BRCMxxxx
Architecture: mipsel
Feed: brcm24 Kernel: 2.4.34 Current toolchain: Uses OpenWrt buildroot gcc-2.4.6-uclibc-0.9.28
Project Page: http://www.nslu2-linux.org/wiki/FAQ/Optware-brcm24Build
Comments: Stable. Some packages does not build.

Fsg3

Feed: fsg3 Current toolchain: armv5b-softfloat-linux/gcc-3.3.5-glibc-2.2.5

Maxtor Shared Storage

Feed: mss
Current toolchain: hndtools-mipsel-linux-3.2.3
Comments: openmss page, may work on SimpleShare as well

Maxtor Shared Storage II

Feed: mssii
Kernel: 2.6.12.6 Current toolchain: arm-none-linux-gnueabi/gcc-2005q3-glibc-2.3.6
Project Page: http://www.nslu2-linux.org/wiki/MSSII/HomePage

Iomega NAS100D (Lude)

Feed: nas100d Current toolchain: armv5b-softfloat-linux/gcc-3.3.5-glibc-2.2.5

Synology DS101

Processor: Intel XScale-IXP425, 266MHz
Architecture: armeb
Memory: 64MB RAM, 16MB Flash
Interfaces: 100 Mbit Ethernet, 3 x USB 2.0, PATA (IDE)
Current toolchain: armv5b-softfloat-linux/gcc-3.3.4-glibc-2.3.3
Feed: ds101
Project Page: HomePage

Synology DS101G

Processor: Freescale MPC8241, 266MHz
Architecture: ppc32
Memory: 64MB RAM, 16MB Flash
Interfaces: Gbit Ethernet, 3 x USB 2.0, SATA
Current toolchain: powerpc-603e-linux/gcc-3.3.4-glibc-2.3.3
Feed: ds101g
Project Page: HomePage

Synology DS107+, DS207+, CS407, RS407

Architecture: arm little endian
Memory: 64MB+ RAM
Interfaces: Gbit Ethernet, ? x USB 2.0, SATA
Current toolchain: arm-marvell-linux-gnu/gcc-3.4.3-glibc-2.3.2
Feed: syno-x07
Project Page: http://www.synology.com/wiki/index.php/Mods_for_Marvell_mv5281_ARM-based_Synology_Products

Processor: Freescale MPC8241, 266MHz
Architecture: ppc32
Memory: 64MB RAM, 16MB Flash
Interfaces: Gbit Ethernet, 3 x USB 2.0, SATA
Current toolchain: powerpc-603e-linux/gcc-3.3.4-glibc-2.3.3
Feed: ds101g
Project Page: HomePage

QNAP TS-101

Processor: SoC
Architecture: powerpc
Memory: 64MB RAM, 16MB Flash
Interfaces: Gbit Ethernet, USB 2.0,
Feed: ts101
Kernel: 2.6, Libs: uClibc-0.9.28 with patches
Current toolchain: gcc-3.4.6-uclibc-0.9.28
Project Page: HomePage
Comments:

Linksys WAG354G

Processor: AR7 (4KEc)
Architecture: mipsel
Memory: 16MB RAM, 4MB Flash
Interfaces: Ethernet (via 4 port switch), 802.11B/G (WiFi), ADSL
Feed: wl500g
Kernel: 2.4.17, Libs: uClibc-0.9.19
Project Page: http://www.nslu2-linux.org/wiki/HowTo/UseOptwareOnWAG354G
Comments: Firmware with experimental support for Optware is Neptune354

Gumstix

Feed: gumstix1151