I'll update this OP as people post. Feel free to leave a personal review, ask questions, etc. Even if you see a program already listed, feel free to add your own personal review in the thread.
This listing is not an endorsement by GCM.
Apologia
Exploring Science Series by John H. Tiner
https://www.rainbowresource.com/prod...Series%29/8429
Memoria Press science products
https://www.memoriapress.com/curriculum/science/
R.E.A.L. Science Odyssey
Quark Chronicles
Houghton Mifflin homeschool science
https://www.hmhco.com/search/shop/ho...tegory=science
Pearson homeschool Interactive Science
https://www.pearsonhomeschool.com/in...locator=PS2t4c
Science Academy series
https://www.rainbowresource.com/prod...my+Series/4376
Usborne Science Encyclopedia and other Usborne science reference books.
Big Fat Notebook Series, the one for middle school science.
https://www.amazon.com/Everything-Yo.../dp/B07BGGFTXQ
Real Science 4 Kids. Written by a homeschool mom with a PhD in biophysical chemistry.
https://www.rainbowresource.com/prod...ations%29/2727
https://gravitaspublications.com/building-blocks/
https://gravitaspublications.com/focus-on/
https://gravitaspublications.com/
Home Science Tools. Textbooks, labs supplies, lab kits, science fun.
https://www.homesciencetools.com/
Carolina Homeschool science supplies. LOTS and LOTS of fun stuff here, including lab kits, owl pellets, live animals, etc.
Quality Science Labs
https://www.qualitysciencelabs.com/index.php?p=home
Crest Resources Library. Free games and experiments.
https://library.crestawards.org/