A free app for Android, by Xavier Roche.

HTTrack app is a free freeware offline browser tool that enables you to download a website from the Internet to a local directory while creating all directories recursively and transferring html, pictures, and other files from the server to your device.

HTTrack also sets up the relative link structure of the original website. You can browse the “mirrored” website by opening a page in your browser and clicking on the links on it just like you would while viewing it online. A current mirror site can be updated, and HTTrack can pick up where it left off with resumed downloads.