If yours is a criminal case, there are very few pro bono attorneys who are not also public defenders. If your lack of income qualifies you for a free lawyer, after you come before the judge and plead not guilty at your arraignment, you can tell the judge you lack the funds to hire a private lawyer and ask him to appoint you a free lawyer.
Otherwise, if this is a civil case, here's a list of pro bono agencies in your state.
You may have to make a number of phone calls, but you should be able to find some hands-on assistance. Also, lawyers in the pro bono loop may know of others, so don't get too discouraged.
Texas has a number of law schools. Another good resource available for free or low priced legal assistance is law school clinics where law students research, write and handle actual cases and issues under the supervision of a practicing professor/lawyer. Some of these law school clinics have excellent reputations, and if a court appearance is called for, the professor goes to court.
Law students are trained legal researchers. They are energetic, idealistic and enjoy putting their efforts into a cause they can believe in. Here's a link to Texas Law school clinics. The kinds of clinics that they have are noted on the list. These clinics are either free to the public or have a sliding fee scale.
Hope this helps.