Hammer Deluxe is an open source half-life 2 modification of the episode 2 engine of which has been modified especially for half-life 2 map makers in order to make much more advanced maps, puzzles and randomized events to make levels much easier to achieve.
These entities may change before the beta by give a good example of whats expected to come.
item_item_crate
This entity was modified to make it possible to spawn 5 different items at the max apon being broken instead of just 1.
item_random_item
A custom entity created to spawn a random selectable item apon map start up or on trigger
logic_random_event
Ever wanted to randomize you're map? This entity will make it so you can't replay a map and finish it exactly the same way everytime by rolling a random number which then triggers a random event in the entitys output table.
npc_zombie
An example of all the npc's of which will be able to be modified via hammer so you can modify the skin, health, models and their will be more coming soon in order to make things like boss's possible without creating a new entity in the source code.
game_string_text
An entity of which you can input 5 different strings and change them via input instead of making 5 different game_text with different channels.
item_crate is maybe better than item_item_crate ?
Every entity is named according to what they are. That entity was named item_item_crate because:
The first 'item_' is to define that it's an item.
Second 'item_' is to tell the mapper whats in the crate ( props? )
Final 'crate' is telling the mapper that it's a crate of items.