diff --git a/_data/package_index.yml b/_data/package_index.yml
index 1c5faef22..e7b8c7120 100644
--- a/_data/package_index.yml
+++ b/_data/package_index.yml
@@ -254,6 +254,13 @@
   categories: interfaces
   tags: cpp gpu opencl
 
+- name: librsb
+  url: http://librsb.sourceforge.net/
+  description: A shared memory parallel sparse matrix computations library for the Recursive Sparse Blocks format 
+  categories: numerical interfaces scientific
+  tags: openmp sparse-matrix sparse-blas linear-algebra
+  license: LGPL-3.0-or-later
+
 # --- Compiler
 
 - name: hipfort
@@ -946,6 +953,13 @@
   license: LGPL-3.0-or-later
   tags: tight-binding quantum-mechanics density-functional-theory
 
+- name: Elk
+  url: https://elk.sourceforge.io/
+  description: An all-electron full-potential linearised augmented-plane wave (LAPW) code with many advanced features
+  categories: scientific
+  license: GPL-3.0
+  tags: density-functional-theory
+
 - name: LATTE
   github: lanl/LATTE
   description: Open source density functional tight binding molecular dynamics
@@ -1162,6 +1176,13 @@
   license: GPL-2.0
   version: none
 
+- name: pencil-code
+  github: pencil-code/pencil-code
+  description: A high-order finite-difference code for compressible hydrodynamic flows with magnetic fields and particles 
+  categories: scientific
+  tags: finite-difference hydrodynamics magnetic-field particles
+  license: GPL-2.0
+
 - name: MOM6
   github: NOAA-GFDL/MOM6
   description: Modular Ocean Model