For NPC, I've met: Delta Zeta, Kappa Delta, Kappa Alpha Theta, Delta Gamma, and a few Alpha Phi's.
For IFC, Sigma Alpha Epsilon, Phi Kappa Theta, Phi Kappa Psi, FIJI, and a few Delta Upsilons.
For NPHC, Phi Beta Sigma!
and MGCLO/NALFO... well. Nu Alpha Kappa, Lambda Theta Alpha, Lambda Theta Phi, Gamma Phi Epsilon, Beta Gamma Nu, Alpha Psi Rho, Alpha Phi Gamma, Delta Sigma Psi, Sigma Alpha Zeta, Gamma Rho Lambda, Sigma Lambda Gamma, Lambda Sigma Gamma, Gamma Zeta Alpha, Sigma Theta Psi, Sigma Lambda Beta, Alpha Pi Sigma, and but of COOOURSE, the lovely
Upsilon Kappa Deltas!