Linear colliders are an attractive platform to explore
high-precision physics of newly discovered particles. The recent
significant progress in advanced accelerator technologies has
motivated their applications to colliders which has been discussed
in the alegro workshop. In this paper we discuss structure
wakefield acceleration, namely collinear wakefield acceleration and
two-beam acceleration. We especially discuss available drive and
witness beam sources based on L and S-band radiofrequency
technology, and also summarize available and forthcoming
longitudinal shaping techniques to improve the overall acceleration
efficiency via the transformer ratio.