- update

Author: janbender

index.md

@@ -22,11 +22,20 @@
 * A Rust library for building advanced applications with the Finite Element Method (FEM): [fenris](https://github.com/InteractiveComputerGraphics/fenris)
 * Higher-order finite elements for embedded simulation: [higher_order_embedded_fem](https://github.com/InteractiveComputerGraphics/higher_order_embedded_fem)
 
+### Energy_based simulation
+
+* A C++ library for symbolic differentiation, code generation, and evaluation, designed primarily for non-linear optimization in physics simulation and FEM: [SymX](https://symx.physics-simulation.org)
+* A C++ and Python simulation platform for simulating rigid and deformable objects in strongly coupled scenarios: [STARK](https://stark.physics-simulation.org)
+
 ### Signed Distance Fields (SDF)
 
 * A C++ library for the parallel discretization of (preferably smooth) functions on regular grids: [Discregrid](https://github.com/InteractiveComputerGraphics/Discregrid)
 * Header only, single file, simple and efficient C++11 library to compute the signed distance function (SDF) to a triangle mesh: [TriangleMeshDistance](https://github.com/InteractiveComputerGraphics/TriangleMeshDistance)
 
+### Surface reconstruction
+
+* A tool designed to reconstruct surface meshes from SPH particle data: [splashsurf](https://splashsurf.physics-simulation.org)
+
 ### Import/Export
 
 * A tool to import particle data in Blender: [blender-sequence-loader](https://github.com/InteractiveComputerGraphics/blender-sequence-loader)