Stackie Mod 1.8, 1.7.10, 1.7.2 is a mod that group all items of the same type and experience orbs into stacks of maximum size.

Configuration: The config file fill be created after you run Minecraft at least once with the mod installed. The config file is located int the .minecraft/config folder. In the config file you can change the following values:

• The delay in ticks (20 ticks = 1 second) that will pass between stacking attempts. If Minecraft runs fine you can lower the value, if it starts lagging you'll want to increase the value.
• The stacking range, which can be set anywhere from one percent length of a block up to 10 blocks length. The default is 0.75 blocks which in my testings was just fine.