Sign the dist as the last step before creating the archive. Take care not to modify/regenerate dist meta files or the manifest.

Error: Old SIGNATURE detected. Please inform the module author to regenerate SIGNATURE using Module::Signature version 0.82 or newer. gpg: Signature made Fri 03 Feb 2012 08:06:44 AM JST gpg: using DSA key 2C5302215F6ADD3A gpg: Can't check signature: No public key ==> BAD/TAMPERED signature detected! <==

Add a META.json to the distribution. Your buildtool should be able to autogenerate it.

Add 'use warnings' (or its equivalents) to all modules, or convince us that your favorite module is well-known enough and people can easily see the modules warn when something bad happens.

Error: App::MathImage, App::MathImage::Curses::Drawing, App::MathImage::Generator, App::MathImage::Gtk1::AboutDialog, App::MathImage::Gtk1::Drawing, App::MathImage::Gtk1::Ex::ComboBits, App::MathImage::Gtk1::Ex::IdleHandler, App::MathImage::Gtk1::Ex::SignalIds, App::MathImage::Gtk1::Ex::SpinButtonBits, App::MathImage::Gtk1::Ex::Units, App::MathImage::Gtk1::Ex::WidgetBits, App::MathImage::Gtk1::Generator, App::MathImage::Image::Base::BMP, App::MathImage::Image::Base::LifeBitmap, App::MathImage::Image::Base::LifeRLE, App::MathImage::Image::Base::Other, App::MathImage::Image::Base::Wx::DC, App::MathImage::Image::Base::XpmClipped, App::MathImage::Wx::Drawing, App::MathImage::Wx::Generator, App::MathImage::Wx::Main, App::MathImage::Wx::Params::Boolean, App::MathImage::Wx::Params::Enum, App::MathImage::Wx::Params::Filename, App::MathImage::Wx::Params::Float, App::MathImage::Wx::Params::Integer, App::MathImage::Wx::Params::String, App::MathImage::X11::Generator, App::MathImage::X11::Protocol::Async, App::MathImage::X11::Protocol::EventHandlerExtra, App::MathImage::X11::Protocol::EventMaskExtra, App::MathImage::X11::Protocol::Splash, Math::NumSeq::Derived::MathImageCumulative, Math::NumSeq::MathImageConcatNumbers, Math::NumSeq::MathImageCunninghamChain, Math::NumSeq::MathImageCunninghamPrimes, Math::NumSeq::MathImageDigitExtract, Math::NumSeq::MathImageGolayRudinShapiro, Math::NumSeq::MathImageHofstadterDiff, Math::NumSeq::MathImageHypotCount, Math::NumSeq::MathImageKolakoskiGroups, Math::NumSeq::MathImageLines, Math::NumSeq::MathImageLinesLevel, Math::NumSeq::MathImageLinesTree, Math::NumSeq::MathImageLn2Bits, Math::NumSeq::MathImageLoeschian, Math::NumSeq::MathImagePadovan, Math::NumSeq::MathImagePiBits, Math::NumSeq::MathImagePiDigits, Math::NumSeq::MathImagePlanePathTurn, Math::NumSeq::MathImagePrimeIndexCount, Math::NumSeq::MathImagePrimeIndexPrimes, Math::NumSeq::MathImagePrimeQuadraticEuler, Math::NumSeq::MathImagePrimeQuadraticHonaker, Math::NumSeq::MathImagePrimeQuadraticLegendre, Math::NumSeq::MathImageReplicateDigits, Math::NumSeq::MathImageRuns, Math::NumSeq::MathImageSieveMultiples, Math::NumSeq::MathImageSpectrum, Math::NumSeq::MathImageSumTwoSquares, Math::NumSeq::MathImageSumXsq3Ysq, Math::NumSeq::MathImageUndulatingNumbers, Math::PlanePath::MathImageCCurve, Math::PlanePath::MathImageCretanLabyrinth, Math::PlanePath::MathImageDekkingCurve, Math::PlanePath::MathImageDekkingStraight, Math::PlanePath::MathImageGrayCurve, Math::PlanePath::MathImagePeanoRounded, Math::PlanePath::MathImagePixelRingsFill, Math::PlanePath::MathImagePyramidReplicate, Math::PlanePath::MathImageQuintetSide, Math::PlanePath::MathImageWunderlichSerpentine

Add all modules contained in this distribution to the META.yml field 'provides'. Module::Build or Dist::Zilla::Plugin::MetaProvides do this automatically for you.

Add a 'repository' resource to the META.yml via 'meta_add' accessor (for Module::Build) or META_ADD parameter (for ExtUtils::MakeMaker).

Add SECURITY(.pod|md). See Software::Security::Policy.

Add SECURITY(.pod|md) and add a contact address. See Software::Security::Policy.

Add CONTRIBUTING(.pod|md). See https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/setting-guidelines-for-repository-contributors.