  KOI-227, KOI-319 and KOI-884 are identified here as (at least) two planet
systems. For KOI-319 and KOI-884, the observed Transit Timing Variations (TTVs)
of the inner transiting planet are used to detect an outer non-transiting
planet. The outer planet in KOI-884 is 2.6 Jupiter masses and has the orbital
period just narrow of the 3:1 resonance with the inner planet (orbital period
ratio 2.93). The distribution of parameters inferred from KOI-319.01's TTVs is
bimodal with either a 1.6 Neptune-mass (M_N) planet wide of the 5:3 resonance
(period 80.1 d) or a 1 Saturn-mass planet wide of the 7:3 resonance (period
109.2 d). The radial velocity measurements can be used in this case to
determine which of these parameter modes is correct. KOI-227.01's TTVs with
large 10 hour amplitude can be obtained for planetary-mass companions in
various major resonances. Based on the Bayesian evidence, the current TTV data
favor the outer 2:1 resonance with a companion mass 1.5 M_N, but this solution
implies a very large density of KOI-227.01. The inner and outer 3:2 resonance
solutions with sub-Neptune-mass companions are physically more plausible, but
will need to be verified.
