Millie
Not Not - A Brain Buster
Surfingers

Hellblade and Dragon Ball FighterZ

An interersting bit of data from the US NPD.

https://mynintendonews.com/2019/06/19/us-npd-reveals-top-5-third-party-nintendo-switch-games/

Per their numbers, the best selling third party games on the Switch in the U.S as of May are

1 - Mario & Rabbids: Kingdom Battle
2 - Crash Bandicoot: N. Sane Trilogy
3 - Diablo III
4 - Just Dance 2019
5 - Just Dance 2018

EDIT: Found an expanded version

https://nintendoeverything.com/best-selling-third-party-games-for-switch/

1 – Mario + Rabbids Kingdom Battle
2 – Crash Bandicoot N. Sane Trilogy
3 – Diablo III: Eternal Collection
4 – Just Dance 2019
5 – Just Dance 2018
6 – LEGO Marvel Super Heroes 2
7 – LEGO The Incredibles
8 – NBA 2K18
9 – Monster Hunter Generations Ultimate
10 – FIFA 18

Doesn't the game release on the 25th on Switch?

+1 Crash Team Racing 

Also, +1 to the N.Sane Trilogy, bought it last year for my brother, but I ended up playing it too so may as well count it.

Third party total: 8

Hey i'm new to this but have been following it for a bit and thought I'd join in as I have a bunch of 3rd party/indie titles on my Switch. Here goes:
Bomberman R
Fast RMX
Football Manager 2019
Golf Story
Human Resource Machine
Inside
Into the Breach
Kamiko
King of Fighters 98
Mario & Rabbids Kingdom Battle
Mighty Gunvolt Burst
Octopath Traveler
Overcooked
Overcooked 2
Puyo Puyo Tetris
Rayman Legends
Skyrim
Snipperclips
Sonic Mania
Stardew Valley
Starlink: Battle for Atlas
Tetris 99 (Don't know if this counts?)

Yep, I'm counting Tetris 99. And welcome!

-Kamiko
-Slain Black From Hell
-Tetris 99

All Digital.

I wonder if any third party title from here on out will manage to catch up to the likes of Doom, Skyrim, and Sonic Mania, given VGChartz is so much less active now than it was in 2017.

Crash Team Racing Nitro-Fueled - physical