Add Boltzmann solver packages to ecosystem

Author: hersle

src/JuliaAstroDocs.jl

@@ -182,6 +182,27 @@ ecosystem() = (
             ),
         ),
         "Galaxies and Cosmology" => (
+            (
+                name = "Bolt.jl",
+                repo = "https://github.com/xzackli/Bolt.jl/",
+                doc = "https://xzackli.github.io/Bolt.jl/",
+                tagline = "Pure-Julia integrator for the Boltzmann equations in cosmology",
+                descr = """
+                - In addition to integrating the cosmological Boltzmann equations, Bolt.jl can accurately compute the gradients of power spectra with respect to cosmological parameters using forward-mode automatic differentiation.
+                """,
+                astropy = [],
+            ),
+            (
+                name = "CLASS.jl",
+                repo = "https://github.com/hersle/CLASS.jl",
+                doc = "https://github.com/hersle/CLASS.jl?tab=readme-ov-file#classjl",
+                tagline = "Julia wrapper for the cosmological Boltzmann solver [CLASS](http://class-code.net/)",
+                descr = """
+                - Lightweight problem/solution wrapper around CLASS input/output files.
+                - Reads CLASS output files to [DataFrames](https://github.com/JuliaData/DataFrames.jl).
+                """,
+                astropy = [],
+            ),
             (
                 name = "Cosmology.jl",
                 repo = "https://github.com/JuliaAstro/Cosmology.jl",
@@ -218,6 +239,18 @@ ecosystem() = (
                 """,
                 astropy = [],
             ),
+            (
+                name = "SymBoltz.jl",
+                repo = "https://github.com/hersle/SymBoltz.jl",
+                doc = "https://hersle.github.io/SymBoltz.jl/stable/",
+                tagline = "Julia package for solving the linear Einstein-Boltzmann equations in cosmology",
+                descr = """
+                - Symbolic-numeric interface for specifying models with simple symbolic equations and automatically compiling them to fast numerical ODE code.
+                - Approximation-free equations are solved without tight-coupling, ultra-relativistic fluid and radiation-streaming approximations.
+                - Differentiable output (e.g. power spectra) with respect to any input (e.g. cosmological parameters).
+                """,
+                astropy = [],
+            ),
         ),
     ),
     "Techniques" => (