You can still buy Altera FPGAs, and you'll still be able to buy Xilinx FPGAs -- they're not going to just throw away a three billion dollar business.

Lattice is probably the next biggest. There's also Microchip (< Microsemi < Actel), Quicklogic, and Gowin.

Nobody really came close to competing with Altera / Xilinx at the high end, though.