  tRecX is a C++ code for solving generalized inhomogeneous time-dependent
Schr\"odinger-type equations $id\Psi/dt = H[t,\Psi] + \Phi$ in arbitrary
dimensions and in a variety of coordinate systems. The operator $H[t,\Psi]$ may
have simple non-linearities, as in Gross-Pitaevskii and Hartree(-Fock)
problems. Primary application of tRecX has been non-perturbative strong-field
single and double photo-electron emission in atomic and molecular physics. The
code is designed for large-scale {\it ab initio} calculations, for exploring
models, and for advanced teaching in computational physics. Distinctive
numerical methods are the time-dependent surface flux method for the
computation of single and double emission spectra and exterior complex scaling
for absorption. Wave functions and operators are handled by tree-structures
with the systematic use of recursion on the coarse-grain level. Numerical,
analytic, and grid-based discretizations can be combined and are treated on the
same abstract level. Operators are specified in the input using a script
language including symbolic algebra. User-friendly in- and output, error
safety, and documentation are integrated by design.
