Spectra of highly ionized Ni, Ge, Kr, Zr and Mo obtained from the JET tokamak have been studied. In total 20 new lines have been classified as n = 2, n = 0 transitions in B-like and F-like ions. Among the identified lines are M1 transitions within the 2s22p5 2p ground term of F-like Zr and Mo and within the 2s22p 2p ground term of B-like Mo. Furthermore, for B-like Ni, Kr and Mo, the 2s2p2 4P1/2 and 4P5/2 levels, which decay by spin-forbidden transitions, have been found. From the observed wavelengths 20 new energy levels were determined. The experiments have been complemented with multiconfiguration Dirac-Pock (MCDF) calculations and semiempirical analyses of transition energies in the B I and F I isoelectronic sequences.