MagicaVoxel is an excellent voxel editor that allows users to import an 8-bit PNG file and use its palette. Provided here is a zip file containing numerous retro styled palettes that can be imported into MagicaVoxel.
This art asset pack is perfect for any developer wishing to work on a platformer game. The download includes art for various tilesheets, player animations and enemy animations. Additional full screen images are included for backgrounds or can be cropped to use as a tessellating tile.
This tileset was somewhat inspired by Alien Breed on the Amiga. Not necessarily totally by the graphics style as Rico is a pixel god :) but by the view (Gauntlet style also). Included is a single level tilesheet which can be used to build numerous levels.
This bitmap game development font pack features 20 fonts of varied pixel sizes mostly based on "nice" programmer numbers such as 8x8, 16x16, 32x32 etc.. these should assist comfortably in your game development.