StreamerTools

Twelve47 create some widgets/games links to twitch. Emote combo, Chat cloud, chance wheel, hype train and more.

interactionsgamewidgetweb

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VTube Studio

VTube Studio

denchisoft.com

Software (Adroid/iOS/PC) to easy animate a 2D avatar. Can stream standalone or be import as virtual cam in OBS.

Free + Paid

Twitch API relay to localhost chat, alerts, and lot of more widgets. Good documentation and a community module forum.

Free