Splinets -- a package with an efficient B-spline orthogonalization suitable for sparse functional data analysis.
Liu, X., Nassar, H., Podgórski, K. (2019) "Splinets – efficient orthonormalization of the B-splines." <arXiv:1910.07341>.
Podgórski, K. (2021) "Splinets – splines through the Taylor expansion, their support sets and orthogonal bases." <arXiv:2102.00733>.