tabularx – Tabulars with adjustable-width columns

The pack­age de­fines an en­vi­ron­ment tab­u­larx, an ex­ten­sion of tab­u­lar which has an ad­di­tional col­umn des­ig­na­tor, X, which cre­ates a para­graph-like col­umn whose width au­to­mat­i­cally ex­pands so that the de­clared width of the en­vi­ron­ment is filled. (Two X columns to­gether share out the avail­able space be­tween them, and so on.)
The pack­age is part of the tools bun­dle in the LaTeX re­quired dis­tri­bu­tion.