RollerCoaster Tycoon 3

Galaxy Flyer CFR by Samplerocker. Can be found under Gentle Rides in the RCT build menu.
Installs to Style\Custom\ folder. (if you don't have a Custom folder under Style, you must create one)
This CFR only works in RCT3 WITH BOTH ADDONS Soaked/Wild! Installation without Add Ons will cause RCT3 to crash.
This ride uses about 2,500 faces and 6 textures in the sizes 4x4 and 64x64 pixels.

Loubauder's Disney Jungle Cruise CTR. Requires Revolutionary Rides Invisible Track.
The boats are not powered and thus require you to use block break sections to push the boat along.

Disney Tram by Ghostscout.
This CTR-Ride requires RCT3 WITH BOTH ADDONS Soaked/Wild! The installation without Addons will cause RCT3 to crash.
(Note: the shown station is not included)

MK I, IV, V, IV, and VII Disney Monorails by Ghostscout. Versions in multiple colors and textures. MK V & VII trains hold only 2 people per car, all the rest hold 4 per car.
You will need to download the "Monorail Set/universal monorail" and install it to use this CTR. This CTR-Ride requires RCT3 WITH BOTH ADDONS Soaked/Wild! The installation without Addons will cause RCT3 to crash.
(Note: the station shown is not included)
 

Disney's California Adventure - World of Color Items by AzoRctMan. Includes Laser, water jet, and mortar.

This set includes lamp posts, stanchions, straight and diagonal hedges, a ride operator console, some new path edges, railings, terrain covers, shuttle loop parts, tables, chairs, trash bins, windows, doors, counters, billboards, and more.

This set contains circus tents, decorative canvas roofs, stadium benches, skeeball machines, pay phones, fancy trims, angled railings, angled walls, and more.

This set contains circus tents, game backdrops, umbrellas, windows, 3h roofs, railings, circus signs, circus paintings, and lots more.

This set contains rustic walls, 1h roofs, wooden floors, marble columns, wooden railings, shutters, bedrock walls, signs, windows, and a lot more.

10 Inversion Intamin CT by Ciniapaes. Originally posted on RealTycoon3.com

Boomerang CT by Cinipaes. Originally posted on RealTycoon3.com

Arrow Corkscrew CT by Cinipaes. Originally posted on RealTycoon3.com

Apocalypse CT by Cinipaes. Originally posted on RealTycoon3.com

Banshee CT by Cinipaes. Originally posted on RealTycoon3.com

Batman: The Ride CT by Cinipaes. Originally posted on RealTycoon 3

This set contains generic billboards in three styles... Single-sided, double-sided, and wooden backed.

This set features updated roofs with better textures and thicker beams and posts.
 

This set contains mostly interior pieces, decor, and furnishings.
 

Updated Alpine Village objects includes stucco walls, windows, doors, path covers, chimneys, roofs, shutters, and curtains.

This is the third set made for Alpine Village in Wonder World. It contains more stucco walls, roofs, beams, posts, doors, windows, chimneys, rock walls, dormer windows, signs, plus flags, castle pieces, corner stones, window flower boxes and more.

This is the second set created for Alpine Village in Wonder World. It contains more stucco walls, windows, roofs, beams and posts, plus rock walls, signs, dormer windows, and more.

This is the first Alpine Village set created for the land in Wonder World. It contains stucco walls, roofs, windows, beams, posts, shutters, chimneys, and lots more.

Author: Rctk1
This is taken from RealTycoon3.com's old website.  It is pretty realistic and features an in-depth layout of the B&M Invert, Afterburn at Carowinds.

This is a custom pyro pack I made for a show that was never finished. Should be placed in the fireworks folder inside of your rct3 installation. Includes a readme file explaining the effect codes of each name.

Set containing terrain blocks in different sizes and forms to make landscaping easier or possible at places where normal landscaping is not possible because of attractions or such. There are many 1/4 tile pieces. The set is divided in 2 parts: 1h height and 2h height. 236 pieces. Created by errt.