Relativistic laser-plasma interactions provide exciting opportunities for tunability and control of laser wakefield accelerators. Recent experiments at Lund University focus on optimizing electron acceleration and X-ray emission through optical manipulation. We also explore the opportunities of using laser-plasma accelerators for applications in confined spaces, such as in industrial and medical settings. In the field medical technology, the work involves using magnetically focused, laser-accelerated electrons with energies up to 160 MeV for precise dose deposition in fractionated stereotactic high-energy radiotherapy, potentially improving treatment outcomes. Furthermore, X-rays from laser-plasma accelerators are used to explore the 3D structure of fuel injection sprays. This technique allows for simultaneous optical fluorescence measurements, which provide valuable insights into various spray systems, including those for clean-combustion biofuels.