Check out a free collection of textures featuring a web-based editor.
Have a look at ArchiTextures, a collection of seamless textures for architectural design. The platform also features a web-based tool that lets users create patterns for bricks, floors, tiles, and all kinds of other surfaces.
The website has a procedural online editor featuring settings for dimensions, patterns, colors, randomization, orientation, plus more. You can download textures free of charge for educational and personal use. There's also a Pro subscription in case you need textures for commercial projects. The Pro edition also unlocks additional parameters and lets you upload your own maps.
The original website was launched in 2014 featuring a library of free seamless textures for architectural drawings and renders. The team's goal was to curate a library of high-quality images for architects and students.
You can learn more here.