1. To search all agencies

For select grant opportunities
http://www.texasonline.state.tx.us/tolapp/egrants/search.htm

For contracting opportunities (current RFPs)
http://esbd.cpa.state.tx.us/

A-Z Index of State Agencies & Depts.
http://www.tsl.state.tx.us/apps/lrs/agencies/

Texas Engineering Experiment Station
http://tees.tamu.edu 

2. To search individual agencies

Cancer Prevention & Research Institute of Texas (CPRIT)

Humanities Texas Grant Programs

The Texas Governor's Office State Grants Team (OG)

Texas Alcoholic Beverage Commission (TABC)

Texas Commission on the Arts (TCA)

Texas Commission on Environmental Quality (TCEQ)

Texas Department of Agriculture (TDA)

Texas Education Agency (TEA)

Texas Higher Education Coordinating Board (THECB)

Texas Historical Commission (THC)

Texas Parks and Wildlife (TPWD)

Texas Department of Health Services Grant Funding (DSHS)

Texas Department of Transportation (DOT)