Manufacturers

Actel Corp
Produces three different styles of FPGAs: antifuse, flash, and SRAM.
http://www.actel.com/

Aeroflex Inc
Qualifies and sells space and radiation hardened semiconductors, including FPGAs.
http://www.aeroflex.com/

Altera Corporation
Manufactures CPLDs and SRAM based FPGAs.
http://www.altera.com/

Anadigm, Inc
Manufactures field programmable analog array (FPAA), an analog version of an FPGA.
http://www.anadigm.com/

Lattice Semiconductor Corp.
Produces analog and digital FPGAs, including the ORCA FPSC assets purchased from Agere (formerly Lucent).
http://www.latticesemi.com/

MathStar, Inc
Reprogrammable logic platform chips, especially for communications and digital signal processing applications.
http://www.mathstar.com/

QuickLogic Corp
Makes stand-alone devices such as PCI bridges, memory controllers, and GbE Ethernet MACs, in addition to FPGAs that integrate parts of the stand-alone devices.
http://www.quicklogic.com/

Xeltek
Manufactures and sales of universal programmer and adapter.
http://www.xeltek.com/

Xilinx, Inc
Manufactures CPLDs and SRAM based FPGAs.
http://www.xilinx.com/