Bukkit

Below are two lists: one of the block names which Offering accepts, the other the mob names. This information is taken from the Bukkit JavaDoc, which you can check if this appears to be out of date .

Block names

(taken from here) AIR STONE GRASS DIRT COBBLESTONE WOOD SAPLING BEDROCK WATER STATIONARY_WATER LAVA STATIONARY_LAVA SAND GRAVEL GOLD_ORE IRON_ORE COAL_ORE LOG LEAVES SPONGE GLASS LAPIS_ORE LAPIS_BLOCK DISPENSER SANDSTONE NOTE_BLOCK BED_BLOCK POWERED_RAIL DETECTOR_RAIL PISTON_STICKY_BASE WEB LONG_GRASS DEAD_BUSH PISTON_BASE PISTON_EXTENSION WOOL PISTON_MOVING_PIECE YELLOW_FLOWER RED_ROSE BROWN_MUSHROOM RED_MUSHROOM GOLD_BLOCK IRON_BLOCK DOUBLE_STEP STEP BRICK TNT BOOKSHELF MOSSY_COBBLESTONE OBSIDIAN TORCH FIRE MOB_SPAWNER WOOD_STAIRS CHEST REDSTONE_WIRE DIAMOND_ORE DIAMOND_BLOCK WORKBENCH CROPS SOIL FURNACE BURNING_FURNACE SIGN_POST WOODEN_DOOR LADDER RAILS COBBLESTONE_STAIRS WALL_SIGN LEVER STONE_PLATE IRON_DOOR_BLOCK WOOD_PLATE REDSTONE_ORE GLOWING_REDSTONE_ORE REDSTONE_TORCH_OFF REDSTONE_TORCH_ON STONE_BUTTON SNOW ICE SNOW_BLOCK CACTUS CLAY SUGAR_CANE_BLOCK JUKEBOX FENCE PUMPKIN NETHERRACK SOUL_SAND GLOWSTONE PORTAL JACK_O_LANTERN CAKE_BLOCK DIODE_BLOCK_OFF DIODE_BLOCK_ON LOCKED_CHEST TRAP_DOOR MONSTER_EGGS SMOOTH_BRICK HUGE_MUSHROOM_1 HUGE_MUSHROOM_2 IRON_FENCE THIN_GLASS MELON_BLOCK PUMPKIN_STEM MELON_STEM VINE FENCE_GATE BRICK_STAIRS SMOOTH_STAIRS MYCEL WATER_LILY NETHER_BRICK NETHER_FENCE NETHER_BRICK_STAIRS NETHER_WARTS ENCHANTMENT_TABLE BREWING_STAND CAULDRON ENDER_PORTAL ENDER_PORTAL_FRAME ENDER_STONE DRAGON_EGG REDSTONE_LAMP_OFF REDSTONE_LAMP_ON IRON_SPADE IRON_PICKAXE IRON_AXE FLINT_AND_STEEL APPLE BOW ARROW COAL DIAMOND IRON_INGOT GOLD_INGOT IRON_SWORD WOOD_SWORD WOOD_SPADE WOOD_PICKAXE WOOD_AXE STONE_SWORD STONE_SPADE STONE_PICKAXE STONE_AXE DIAMOND_SWORD DIAMOND_SPADE DIAMOND_PICKAXE DIAMOND_AXE STICK BOWL MUSHROOM_SOUP GOLD_SWORD GOLD_SPADE GOLD_PICKAXE GOLD_AXE STRING FEATHER SULPHUR WOOD_HOE STONE_HOE IRON_HOE DIAMOND_HOE GOLD_HOE SEEDS WHEAT BREAD LEATHER_HELMET LEATHER_CHESTPLATE LEATHER_LEGGINGS LEATHER_BOOTS CHAINMAIL_HELMET CHAINMAIL_CHESTPLATE CHAINMAIL_LEGGINGS CHAINMAIL_BOOTS IRON_HELMET IRON_CHESTPLATE IRON_LEGGINGS IRON_BOOTS DIAMOND_HELMET DIAMOND_CHESTPLATE DIAMOND_LEGGINGS DIAMOND_BOOTS GOLD_HELMET GOLD_CHESTPLATE GOLD_LEGGINGS GOLD_BOOTS FLINT PORK GRILLED_PORK PAINTING GOLDEN_APPLE SIGN WOOD_DOOR BUCKET WATER_BUCKET LAVA_BUCKET MINECART SADDLE IRON_DOOR REDSTONE SNOW_BALL BOAT LEATHER MILK_BUCKET CLAY_BRICK CLAY_BALL SUGAR_CANE PAPER BOOK SLIME_BALL STORAGE_MINECART POWERED_MINECART EGG COMPASS FISHING_ROD WATCH GLOWSTONE_DUST RAW_FISH COOKED_FISH INK_SACK BONE SUGAR CAKE BED DIODE COOKIE MAP SHEARS MELON PUMPKIN_SEEDS MELON_SEEDS RAW_BEEF COOKED_BEEF RAW_CHICKEN COOKED_CHICKEN ROTTEN_FLESH ENDER_PEARL BLAZE_ROD GHAST_TEAR GOLD_NUGGET NETHER_STALK POTION GLASS_BOTTLE SPIDER_EYE FERMENTED_SPIDER_EYE BLAZE_POWDER MAGMA_CREAM BREWING_STAND_ITEM CAULDRON_ITEM EYE_OF_ENDER SPECKLED_MELON MONSTER_EGG EXP_BOTTLE FIREBALL GOLD_RECORD GREEN_RECORD RECORD_3 RECORD_4 RECORD_5 RECORD_6 RECORD_7 RECORD_8 RECORD_9 RECORD_10 RECORD_11

Mob list

(Taken from here) CREEPER SKELETON SPIDER GIANT ZOMBIE SLIME GHAST PIG_ZOMBIE ENDERMAN CAVE_SPIDER SILVERFISH BLAZE MAGMA_CUBE ENDER_DRAGON PIG SHEEP COW CHICKEN SQUID WOLF MUSHROOM_COW SNOWMAN VILLAGER