The best alternatives to Speed Cards are Dashworks, Infinity New Tab, and MultiNewTab. If these 3 options don't work for you, we've listed a few more alternatives below.
MultiNewTab is a chrome extension that enables you to use several 'New Tab' chrome extensions at the same time without having to manually enable and disable them all the time.
Minimal startpage is a minimal startpage app that can be installed in a browser as a startpage. It looks stunningly minimal and helps boost productivity. It also supports a plethora of customizations right from the settings inside the page itself.