Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
RegexBuddy - RegexBuddy is your perfect companion for working with regular expressions.
BookmarkSheet - Your bookmarks in Google Sheets
Regex Forge - An Ultimate Regex Editor for macOS
Annotate.tv - Optimize your learning on YouTube
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.