Available at https://ennea.github.io/ffxiv-strategy-board-viewer/.

There's also an embed.html you can use if you'd like to embed a strategy board somewhere:

<style>
    iframe {
        width: 1024px;
        height: 768px;
        border: none;
    }
</style>

<iframe src="https://ennea.github.io/ffxiv-strategy-board-viewer/embed.html#[stgy:a0+k-wvprSQA8rHpf1cY9Fk5R6ZNO5n7lvBSj9+rmE3OpbNbquadZFNuf34LKtB6Vvu+VwRuRlBjVWYHUviSUm70CoiZFyhI4mL2zvz2dqd2H+n24dmIzgMnUiI7BIEsAjEu6Yw8QNW73V4PV9for2+LXvcEt7lWK15eZwHDQojZm4juqzJiypDd5BkvBnZNs5j2tK]"></iframe>

Inline CSS for example purposes only of course. Feel free to pick a different size for the iframe, aspect ratio is 4:3. The canvas inside the embed.html will scale to whatever size you pick for the iframe.