  The self-energy, spectral functions and susceptibilities of 2D systems with
strong ferromagnetic fluctuations are considered within the quasistatic
approach. The self-energy at low temperatures T has a non-Fermi liquid form in
the energy window w<Delta near the Fermi level, where Delta is the ground-state
spin splitting for magnetically ordered ground state, and Delta ~ T^(1/2)
ln^(1/2)(vF/T) in the quantum critical regime (vF is the Fermi velocity).
Spectral functions have a two-peak structure at finite T above the magnetically
ordered ground state, which implies quasi-splitting of the Fermi surface in the
paramagnetic phase in the presence of strong ferromagnetic fluctuations. The
triplet pairing amplitude in the quasistatic approximation increases with
increasing correlation length; at low temperatures T<<Delta the vertex
corrections become important and the Eliashberg approach is not justified. The
results for the spectral properties and susceptibilities in the quantum
critical regime near charge- (spin-) instabilities with large enough
correlation length xi>>(T/vF)^(-1/3) are obtained.
