There are 3 repositories under spectral-graph-theory topic.
Maximizing algebraic connectivity for graph sparsification
Graph Signal Processing in R
Using spectral graph theory to analyze two biological networks
Research algorithms and data structures in several languages
Graph Uncertainty Principle PlaYground
Visual-Approaches-for-Clustering-Tendency-Assessment-of-Graph-Data
The code for our ICLR 2024 paper: "Beyond Spatio-Temporal Representations: Evolving Fourier Transform for Temporal Graphs"
Spectral graph theory algorithms in Python