This is by no means a comprehensive list, but just some that I've come across and been impressed by. If anyone has any they'd like to share, please post and I will add them.
Some of these links are from Mistrust's
Resource Links topic.
Also note that some of these sites have terms of use and most require credit.
It is your responsibility to credit the makers of any resources you use under their terms.Generators
Blackscrap - A detailed face generator which gives each face in eight expressions and possible with different costumes as well. Quite limited with hair types so far though. The male generator is the fourth link up from the bottom while the female generator is the third.
FaceMaker - A tool for generating facesets.
Famitsu Character Generator - A tool for generating character sets with a number of unique sprite parts and a ton of excellent customization options. Please read the topic fully to understand the instructions there.
JunkHunt Character Generator - A tool for generating character sets, particularly useful for RTP frankenspriting. Please read the thread fully to understand the instructions located there.
JunkHunt Roof Tile Generator - A tool for generating excellent roof tiles. Please read the thread fully to understand the instructions located there.
MOROMAGA's Face Generator - A great tool for generating faces with a lot of parts. Please read the topic fully for a tutorial on using the site.
Sakura Generator - A great tool for generating character sets. Lots of great Japanese style clothing as well.
[CURRENTLY OFFLINE]Forum Resources
RMVX Resources Database - A collection of excellent user-submitted resources
RPGMakerVX.net Resource Showcase - A large collection of user-submitted resources.
RPG Maker Web Resource Showcase - The official forum for RM, with a nice collection of user-submitted resources.
RPG RPG Revolution resource Submissions - A large collection of user-submitted resources
Graphical Resources
Arcane Realm - Some great resources by Soruve; faces and tiles in particular.
Bei Tileset VX - Some lovely tiles.
Biglobe - A great site for some cartoon-style battlers and faces - most of the site is RMXP, but a lot of the VX RTP has been redone in the same style and looks great. Besides, you could also use XP battlers for your enemies.
Blogshin Tiles - Some great tilesets.
Bubble Blog - Some great animations
Cacoa Soft - A nice site with some tiles, battlers, windowskins, and more
Caged Chimera - A great site for RTP VX faces.
Cap:20 - Great Facesets
Castle Nirvana - Some excellent RTP faces and battlers.
Closet - Absolutely lovely battlers. Some are splices of existing RTP battlers, others are palette swaps and still others are custom, but they are all high quality and quite nice.
Cradle of Cyanide - Tons of wonderful battlers! Remember to go to each category along the side.
Crankeye - Great resources of all types for all makers.
ESPRI-Q Blog - A nice site with quite a few custom sprites and faces in the RTP style
Extension of the Third - A Japanese sitw with great RTP-style charsets and facesets.
First Seed Material - has all of Mack's work for VX, including his excellent
character setsGame Clover - A nice collection of resources, including tileset pieces and charactersets.
Kaduki Resources - Some great characters with matching facesets. There are multiple expressions for the faces, as well as multiple poses for the charsets. Really great stuff. There are also other resources available on the site, such as tileset pieces, windowskins, and icons.
Lorestrome Trash - Mostly RMXP resources, but there are a number of battlers labelled Monster001-Monster092 that can also be used for RMVX. Credit to Hyptosis.
Middle Fingers - Some nice facesets
Milano Cat - Some nice side-facing battlers.
Nakkuruman Sprites - Well known for his RMXP stuff, he has also worked on quite a few VX sprites.
Naramura - Naramura is best known for his excellent resources for RMXP, but he also has redone some of the RTP facesets beautifully, and they are definitely worth checking out.
Pinemaker Blog - PinedaVX is a great character set maker; there are a lot of great resources on Pineda's site.
[OFFLINE]Qut Battlers - Absolutely fantastic battlers provided for the RTP, as well as even more custom. Really fantastic battlers. Get them. Now. [Note: some of their original design stuff is NSFW]
Room Mate - Some great facesets and animations
RPG Maniacs - A few tilesets, facesets, and charactersets, primarily related to the Final Fantasy series
SD-Arius Photo Gallery - Lots of pretty much every resource out there - tiles, battlers, windowskins, etc..
OFFLINETerraVX Album - Some great character templates, icons, objects and tilesets by Terra-chan
Toewaemo - A blog with some faces and materials.
Tsukuru Blog - A blog with original resources. This is the same site that has the Famitsu Character Generator, and its resources are very high quality.
Unfinished Cardboard - Some nice general resources, including character sets and tiles
VX Sozai - Great modern resources.
Wild Battlers - A ton of nice battlers.
[OFFLINE]ZPU Gallery - Some nice tilesets and other resources
Audio Resources
RPG Maker Music Pack - A full collection of excellent video game songs written and shared by Bobby Richeson.
55 Sites Free SFX - 55 Great Websites to Download Free Sound Effects.
FFShrine Music - THOUSANDS of anime and video game soundtracks in mp3 format, for free
Free Sound - A good site for SEs, all of which are under CC licenses.
HOTSOMS - 60 songs perfect for RPGs
Overclocked Remix - Video game music
Open Composer - A great tool that lets you generate your own music. Go to
this topic for instructions on use.
Senses Circuit - Lots of free BGM and sound effects
Video Game Music Archive - More Video Game Music
Video Game Rips
Golden Sun Rips - A lot of nice rips from Golden Sun.
The ShyGuy Kingdom - A mass variety of sprite sheets from existing games that can be easily ripped and reused
RPG Legion Battlers - A lot of monster rips from a number of popular games.
Discord
Light Style