I am in the development process for a DMs Guild product that will be formatted similarly to Xanathar's Guide to Everything and Tasha's Cauldron of Everything, and similar in page count, content, and style to them. This product will be called Levistus's Codex of Curiosities, and will be coming out probably a few months after the release of TCoE. This is what I plan to have in the book so far. 

Character Options

Subclasses

• Artificer - Archivist, Chronoturgist, Runesmith, Vehiculist
• Barbarian - Path of the Juggernaut, Path of the Steel Fist, Path of the Titan
• Bard - College of Dance, College of Sound
• Cleric - Darkness Domain, Fate Domain, Frost Domain, Moon Domain
• Druid - Circle of the Sun, Circle of Winter, Circle of the Void
• Fighter - Archer, Dragon Rider, Elemental Warrior
• Monk - Way of the Towering Titan, Way of the Psionic Spirit, Way of Phasing
• Paladin - Oath of Freedom, Oath of Ice, Oath of Souls, Oath of the Arcane
• Ranger - Deep Predator, Frost Strider, Wild Knight
• Rogue - Heathen Hunter, Luck Shifter, Sniper, Time Warper
• Sorcerer - Arcane Soul, Bladeborn, Feyblood, Frozen Heart
• Warlock - The Arcane One, The Cold One, The Construct, The Dracon
• Wizard - Fleshwarpers, Hypnomancy, Lifedrinking Magic, Phantom Magic

Feats 

Damage-Type Feats, Planetouched Feats, Fighting-Type Feats, Multiclass Feats

Spells

Artificer Spells, Elemental Spells, Dunamancy Spells, Gish Spells

Hybrid Races

Create-Your-Own-Hybrid System

Equipment

Weapons, Weapon Customizations, Armor and Shields, Magic Items

Dungeon Master's Tools

Rituals, Variant Rules, Plot Generating Tables, Villain Names and Title Generators

(Green means I have the first draft completely written down, Blue means I have the concept and possibly some mechanics down, Red means I have the concept and name, Purple means the content is linked.) 

That is the summary of the content. Content will be introduced in this thread, which contains the homebrew subclasses/spells/systems, and will have surveys for feedback. 

I cannot stress enough how much I love this idea. I've read the majority of your Subclasses, and I love most of them. I will be waiting with baited breath :D

Question: Will you have anything other than Subclasses (your new Weapons and Weapon Customizations, for instance)? I assume that you will, you just haven't written them down yet.

Either way, :D 

Thanks a lot. I will have other stuff besides my subclasses. I was meaning to type them up yesterday, but ran out of time. I will do so today. 

Sounds cool!

Okay, I have finished updating the OP with the content that it will contain. I will continue to do so in the future as I develop more content on this site. 

i'm really exited for the hybrid races (I originally had something like it, but mine was terrible, so i took it off the site) and dungeon master tools! hope it all goes well making it!

do you know when it will come out? i'm super exited to get it!

also, the blade born sorcerer, my favorite of you homebrew, is not here?

I currently do not have an estimated date, yet. I'm still working on the Illicit Esoterica forms, once I'm done with all of them (which will require a lot of feedback), I will probably start getting things more finished. 

I haven't updated the content post in awhile, but the Bladeborn Sorcerer will be in it (I've edited the post to show that).

sounds neato, I like the sound of a moon domain and fey sorcerers

I really love the create your own hybrid races idea and the rituals idea! What is the juggler? Also when will the next batch of subclasses be released for review? Thanks!

Thanks! The Juggler is a rogue that can enter a "juggling mode" (still need a name for it), taking out light thrown weapons and throwing them as if they were finesse. The next batch of subclasses will probably come out soon, but I would like more answers to the current surveys before then (I have enough for the first one, but the latest two only have 5 and 4 answers). 

Okay, I have updated the original post, adding links to the subclasses that have been put onto this site. 

I can't wait to see the runesmith.

As much of it as I can. I have already had a few people playtest some of the subclasses for me. Also, I know the general balance of the game well enough to not need to playtest certain small aspects of it (such as the spells that are just different damage types of Green-Flame Blade/Booming Blade, and the feat that gives an Infusion, etc). 

I will playtest everything that requires playtesting, with others helping with the process. 

All of your homebrew is really cool, I wish you luck and will try to give feedback on your homebrew when I am able.

this is crazy i love these subclasses

!

Thanks! Any favorites? 

any updates on the release dates?