(note: Some modules below will only enable tracing within the CURRENT package. To fix this — to enable tracing everywhere:
use everywhere '...';
)

automatically trace things, without having to add code in every subroutine

• Devel::DumpTrace
• Devel::Trace
• Devel::Trace::More
• Devel::Trace::Fork
• Log::Trace
• Debug::Trace
• Acme::Echo
• even more detailed tracing
  • Runops::Trace
  • Devel::STrace
• other funky stuff
  • Devel::Spy
  • Tie::Trace
• interfaces to truss/strace/etc (ie. can be used for non-Perl programs)
  • Sys::Trace

only displays a full stack (with subroutine arguments) for very specific conditions... not every line

• Carp::Trace
• Carp::REPL

not a full trace, but incredibly fucking useful nonetheless

• Smart::Comments
  • same as Devel::Comments?