Sale of Chametz through Temple Beth-El
Passover Service Schedule at Temple Beth-El
Haggadot and Seder Materials
Haggadahs-R-Us is a good source of a variety of haggadot.
Haggadot.com lets you compile your own custom haggadah.
Velveteen Rabbi's Haggadah for Pesach by Rabbi Rachel Barenblat
HIAS Haggadah with material on Passover and refugees
T'ruah's Human Rights Haggadah can be used as a seder companion or source of readings as well.
The Israeli liberal Orthodox group Tzohar has released a guide for celebrating Pesach and the seder with loved ones with dementia. (Note that if you scroll down below the document preview, there is a Download button to obtain the entire PDF.) While some of its concerns are specific to Orthodox and strictly-observant Conservative practice, there are also compassionate and helpful suggestions that are broadly applicable.
Poems around the Seder Table: Rachel Korazim curated this collection of poetry from many sources for the seder - attributions are within.
National Council of Jewish Women has published The Five Women of the Exodus: A Feminist Supplement to the Haggadah
The stunning Haggadat Herut / Freedom Haggadah published in Israel last week has been translated into English and is available as a flipbook here.
General Passover Resources
MyJewishLearning's Passover resources are rich, with something for everyone.
Hadar's Passover supplement this year has thought-provoking essays as well as activities for kids and families.
The Hartman Institute has articles, videos, and podcasts on Passover.
Guidance on Passover Cleaning and Kashrut
Passover Guide from Rabbinical Assembly for 5783. This is a mainstream guide to Passover practice that sticks to what is actually required under Jewish law, rather than stringent customs that make holiday preparation unnecessarily challenging.
This document by Rabbi Aaron Alexander contains further detail about the thinking going into some of the Passover Guide's approach as well as some further helpful information.