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Interactive Tsumego (Go puzzles)
⬤ Black to Play
Simple, mobile friendly website with puzzle strength progression.
⬤ Tsumego Hero
An online game based around solving go puzzles. Levels, achievements, scoreboards, that sort of things.
⬤ OGS puzzles
OGS section with many collections of varying strength, length, and approach.
⬤ 101Weiqi
Chinese language tsumego site with a vast collection of problems. Details on how to register and navigate can be found here.
For Chrome and other Chromium-based browsers there is 101weiqiLocalizer, an open-source extension that partially translate the website in English.