Celeste Category Extension Leaderboards: https://www.speedrun.com/celeste_category_extensions. This contains leaderboards for category extensions (e.g Prologue IL, Assist Mode, Epilogue Pies) and individual level leaderboards for the Super Dash variant. (If you are looking for normal individual level leaderboards, they are found here instead.)

Modded Celeste leaderboards: https://www.speedrun.com/modded_celeste. This contains leaderboards for individual modded maps (e.g Path of Hope, Shade World, Cat Isle).

Other Modded Celeste leaderboards: https://www.speedrun.com/series/celeste_series/games. This contains leaderboards (with fullgame and individual level categories) for full campaign mods such as Strawberry Jam, Monika's D-Sides and Glyph.