The best alternatives to Slinky are Lurchr, WebCrate, and Blinkenlights. If these 3 options don't work for you, we've listed a few more alternatives below.
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WebCrate helps you organize and share links, articles and more from around the web in a central place. It's open source & can be easily self-hosted thanks to your own personal cloud in Deta Space. It's more than just a bookmarking tool.
Fastgrep is an app built for Slack that helps teams more easily find and organize links and files shared by their team members across their workspaces. All you need to do is add Fastgrep to Slack and it will start listening to all links and files that you and your teammates share. Then simply type /links or /files and voilà!