Now ~150 routines remains to translate (Thanks to Claude Code), I will keep the repo private until 100% complete.
https://github.com/jamestjsp/slicot.c

SLICOT C11 Translation Status

Summary

Well-Tested Translated Routines

State-Space Analysis & Transformation (AB family)

Controller Design (SB family)

Descriptor Systems (SG/TG family)

System Identification (IB family)

Transfer Functions (TB/TC/TD/TF family)

Matrix Computations (MB family)

Filtering (FB family)

Polynomial Operations (MC family)

Notable Routines Pending Translation

High-Priority Controller Design

Spectral Factorization & Coprime Methods

Model Reduction

Polynomial & Matrix Fraction Operations

Descriptor System Transformations

Transfer Function Conversion

Complex/Periodic Matrix Operations

Translation Statistics by Family

Getting Started

# Install
pip install slicot

# Example: Solve Riccati equation
import numpy as np
from slicot import sb02od

A = np.array([[0, 1], [-2, -3]], dtype=np.float64, order='F')
B = np.array([[0], [1]], dtype=np.float64, order='F')
Q = np.eye(2, dtype=np.float64, order='F')
R = np.array([[1]], dtype=np.float64, order='F')

X, rcond, wr, wi, S, U, info = sb02od('D', 'B', 'N', 'U', 'S', 'N', 2, 1, A, B, Q, R, L=None)
print(f"Riccati solution X:\n{X}")