While there isn't a readily available, comprehensive list of all her projects online, here are some of the most prominent ones:
Anime
* Gundam Wing (1995) as Relena Peacecraft (one of her most well-known roles)
* Neon Genesis Evangelion (1995) as Misato Katsuragi
* Magic Knight Rayearth (1994) as Hikaru Shidou
* Sailor Moon (1992) as Usagi Tsukino/Sailor Moon (in the first 4 seasons)
* Serial Experiments Lain (1998) as Lain Iwakura
* Ghost in the Shell: Stand Alone Complex (2002) as Major Motoko Kusanagi
* The Vision of Escaflowne (1996) as Hitomi Kanzaki
Live-Action
* The Ring (2002) as Shizuko Yamamura
* The Grudge (2004) as Kayako Saeki
Other Notable Works
* Cowboy Bebop (1998) as Julia
* Ghost in the Shell (1995) as Major Motoko Kusanagi
* Vampire Hunter D: Bloodlust (2000) as Leila
It's important to note that this list is not exhaustive and there are likely many other projects she has been involved in over her long career.
If you'd like to know more about specific roles or projects, please feel free to ask!