GitHubPaclets.m

<|
  "b3m2a1"          -> {"mathematica-BTools"}, 
  "CarlWoll"        -> {"MatrixD", "Stack-Exchange-Stylesheet", "TensorSimplify", "DifferentialOperator"}, 
  "cekdahl"         -> {"jSoupLink", "wl-wordpress-xmlrpc-client", "OBJImporter"}, 
  "kubapod"         -> {"MPM", "M2MD", "DevTools", "WLForms", "MoreUI", "MGUI", "Meh" "MVue", "MoreCalculus", "PreciseTracking"}, 
  "szhorvat"        -> {"IGraphM", "MaTeX"}, 
  "tpfto"           -> {"Carlson", "MoleculeViewer", "Wright", "CMLConvert"}, 
  "WolframResearch" -> {"FEMAddOns", "GitLink", "RhinoLink"}
|>

Known Mathematica paclets distributed via GitHub releases assets.md

Each of those can by installed with ResourceFunction["GitHubInstall"], e.g.:

ResourceFunction["GitHubInstall"]["kubapod", "mpm"]

or using MPM` paclet:

MPMInstall["kubapod", "mpm"]

Please contribute.