Any fledgling script writer and AUTOIT. There are AUTOIT forums if you write it and it needs a tweak or explanation. Example search.
https://www.google.com/search?q=Filling+a+web+form+with+autoit
Beware that some sites start to ban users that use bots and scripts.
Note: Edited for spelling.
Our group accesses a web application twice a week to make online reservations. The app to make reservations opens for the day of the week 6 days hence at precisely 7:00 am for my group and other groups. At 7:00 am, the link for the day of the week 6 days away becomes live, and the available reservation times are shown. The first person to hit the first time gets that time and then other information required is tabbed and populated from drop down menus. Working quickly, one can fill everything in in less than 30 seconds, entered for the reservation time captured by the speed of your original click and internet link. One group has somehow created a type of script that always grabs the first time, populates all of the fields, and completes everything in less than a second. What technology would our group have to avail ourselves of in order to run a script at a precise time to compete with this technologically savvy group?
Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic