These are some scripts that may or may not be of assistance.
Not all of them were written by me, and I may have done changes to most of them.

draw_self() 
http://pastebin.com/hhXsSuvq
This is the same as GM8.1+ draw_self().
Returns nothing.

create_model() 
http://pastebin.com/vy2dbJJU
.OBJ file importer
Returns a model index.

object_tile_connect() 
http://pastebin.com/Qv6Q0ZpX
A way to quickly connect objects so they all look like one.
Returns nothing.

draw_shadow_all() 
http://pastebin.com/i8EvPeeR
Basic script to draw shadows.
Returns nothing.

is_even() 
http://pastebin.com/9RTHz8gm
Returns if a number is even. (Only works for whole numbers)
Returns a boolean.

mouse_within() 
http://pastebin.com/x3VUtqHK
Returns if the mouse is between the specified points.
Returns a boolean.

mouse_within() 
http://pastebin.com/wSbL5pwm
Returns if the mouse is between the specified points.
Returns a boolean.

draw_text_multicolor() 
http://pastebin.com/ax8mJW8D
A script to draw multi-colored and formatted text, easily expandable.
Returns nothing.

get_pokemon_name() 
http://pastebin.com/WMd6W8yt
This will convert a national dex number to a Pokémon name.
Returns a string.

get_pokemon_dex() 
http://pastebin.com/9TRErNPr
This will convert a Pokémon name to its national dex number.
Returns a real.