Console-linenumber-plugin is a project mainly written in ..., it's free.
Jenkins Plugin to prefix build console output with linkable line numbers
Jenkins Console Line Number plugin
A Jenkins build wrapper plugin that, when activated for your project, will add html linkable line numbers to the job console output.
Each line is linkable via the an "#nnn" suffix on the "consoleFull" link for any job. For example, to send someone a link to the 150th line of your "MyBuild" run number 10, you can send them the URL: http://myjenkins.server.com/job/MyBuild/10/consoleFull#150