Texas Education Agency main page with teacher resource links. This is the official source for guidance related to Early Childhood Education in Texas. 

The Children’s Learning Institute (CLI) is a leader in the development of research-based tools to improve early education quality. In 2014, CLI partnered with state agencies to build a platform that could deliver these tools to a greater number of programs. This platform, CLI Engage, now houses free resources for educators and families of children ages 0-6.

They have a nice toolkit for teachers and families.

CLI Engage is a comprehensive professional development and child progress monitoring platform. 

Texas School Ready (TSR) is a comprehensive preschool teacher training program through the CLI. 

This is a direct link to those resources.