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docs/index.md

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 - [DyNeuSR](https://braindynamicslab.github.io/dyneusr/) is a Python library for visualizing topological representations of neuroimaging data. The package combines visual web components with a high-level Python interface for interacting with, manipulating, and visualizing topological graph representations of functional brain activity.
 
+- [Reciprocal Isomap](https://calebgeniesse.github.io/reciprocal_isomap) is a reciprocal variant of Isomap for robust non-linear dimensionality reduction in Python. `ReciprocalIsomap` was inspired by scikit-learn's implementation of Isomap, but the reciprocal variant enforces shared connectivity in the underlying *k*-nearest neighbors graph (i.e., two points are only considered neighbors if each is a neighbor of the other).
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+- [Landmark Cover](https://calebgeniesse.github.io/landmark_cover) is a landmark-based cover for Mapper. `LandmarkCover` was designed for use with [KeplerMapper](https://kepler-mapper.scikit-tda.org/en/latest/), but rather than dividing an *extrinsic* space (e.g., low-dimensional projection) into overlapping hypercubes, the landmark-based approach directly partitions data points into overlapping subsets based on their *intrinsic* distances from pre-selected landmark points.
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 ## **References**