All vector .sketch files are editable in Sketch, Figma, Adobe XD. Sketch App Sources is the largest collection of icons, UI kits, wireframes, and free design resources for Sketch.
UI Prep Style Guide - Figma resources - FreebiesUI
UIDE Kit - Sketch Style Guide Template Freebie - Download Sketch Resource - Sketch Repo
Style Guide Flat Ui Kit - Figma Resources - FreebiesUI
Style Guide Template Sketch freebie - Download free resource for Sketch - Sketch App Sources
Style Guide Template for Sketch Freebie - Download Sketch Resource - Sketch Repo
Eggplore UI Style Guide
Medium Images and Grids Sketch freebie - Download free resource for Sketch - Sketch App Sources
To Do List App Freebie
Style Guidelines
Free Styleguide Templates for Your Web Projects - 1stWebDesigner