..Since you asked for cool space weapon suggestions..
Temporal Displacement Canon: Canon shooting a single shot flash with wormhole properties.
Upon impact, the target is randomly moved out of range.
Magna Canon: Canon firing a pulsating beam.
While the target is being hit, it becomes increasingly magnetic.
Nearby ships will be attracted with a chance of crashing in to the target, your own ships may suffer from this as well.
EMP wave: Conical expanding electric magnetic pulse.
Those hit by the wave will be temporarily disabled, your own ships as well.
The closer you are to the source, the longer the effect lasts.