2D Frame Analysis Dynamic Edition 7.3 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions of the software 5.8, 5.7 and 5.5. The program is included in Education Tools. The actual developer of the software is EngiSSol. We recommend checking the downloaded files with any free antivirus.
From the developer:
ANALYSIS:
Static and dynamic analysis of multi span beams, 2D trusses and 2D frames
Modal analysis and eigenvalues estimation
User controlled damping coefficient, step and time parameters
Mode superposition method in order to calculate the dynamic response
Automatic creation of consistent mass matrix
Multi-step dynamic analysis
Definition of time-dependent loading on elements and nodes
Unlimited number of Nodes and Beams
All type of boundary conditions (fixed, rollers, etc.
You may want to check out more software, such as EngiSSol - 2D Frame Analysis, 2D Truss Analysis or FrameSolver 2D, which might be similar to 2D Frame Analysis Dynamic Edition.