From Free Pascal wiki
ATLinkLabel is a component: label which shows an URL,
- it's hilited with a color on mouseover
- it opens browser on click.
It is class TLinkLabel. It has new props:
- Link: string: it is URL
- ColorLinkNormal: TColor: color of label when passive
- ColorLinkMouseover: TColor: color of label on mouseover
MPL 2.0 or LGPL.
It's in the ATButtons package (pkg adds icon to Lazarus palette), or you can get only file ATLinkLabel.pas w/o package: