This page contains links to free resources that you may find helpful:
Google Scholar: scholar.google.com
Use this site to research legal cases from the federal courts and all the state courts. This is the first goto site for finding case law. One trick. If the case you entered in the search block doesn't seem to show up in the search list, look to see if it is inside any of the cases that did show up. Usually there is a link to take you to the page. Sometimes there that case isn't in the database and the link will take you to the how cited page. The how cited page is an excellent resource to find other related cases or to shepardize the case.
Legal Information Institute: law.cornell.edu/
Cornell Law School provides this site and it is an excellent resource site for many uses. I always choose this cite when looking for the precise language of our constitution. It has information about how to cite cases, how to read case citations, federal rules of procedure, and much other valuable information. If you are a serious pro se litigant ready to learn, you should definitely spend a lot of time here.
U.S. Supreme Court: supremecourt.gov/
This site contains a wealth of information that you may find useful. I particularly like the slip opinions, which are the newest opinions in an individual PDF, and the bound volumes. Every year, the court's opinions are bound and published in "bound volumes." The titles of these volumes are the case citations. If you want the absolute definitive source of what the Supreme Court said, find the volume number in the citation and open that volume from this site: Bound Volumes. The first number in the citation after the volume reference will be the first page number of the case. Other federal courts and state courts use different publishing methods but they are in the citations for those cases. More information about Supreme Court Opinions: here.
Sometimes it is useful to hear the arguments made before the Court and the questions the Justices had for the attorneys. The Court's oral arguments are recorded as audio only and can be found here.
Supreme Court Justices regularly give speeches that tell you a lot about how they think and about the history of law and of the court. A list of those can be found here.
About the Court: There is a comprehensive section that gives you a wealth of information about the current court, its justices, and its practices. This section also provides a wealth of history. You can see it here.
Federal Courts: uscourts.gov/
This is a definitive government site that tells you everything you ever wanted to know about the federal courts and it includes forms that can help you in filing federal suits. Just keep in mind that federal courts do NOT deal with divorce, alimony, or child-support. You cannot directly file such a case in a federal court nor can you appeal such a case to any federal court except the U.S. Supreme Court and then only after you have gone through every layer of appeal your state offers.
Federal Practice Manual for Legal Aid Attorneys: federalpracticemanual.org/
This is an excellent guide to different kinds of federal suits with overview of the critical cases that apply to each aspect of the suit. It has been an invaluable starting point for researching how to file federal suits.
Texas Constitution and Laws: statutes.legis.state.tx.us/
I live in Texas and my custody battles were in Texas, therefore I have a lot of experience with Texas laws and its constitution. This is the official state source for Texas laws and the Texas Constitution and it is a very well designed and useful site. I use this site multiple times every week. If you look just past the quick search box, you will see "Texas Constitution" and below that "Texas Statutes" with little plus signs to the left of them. Click the plus sign to expand each entry. This is the fastest way to find what you want if you know where it is.