resource recommendations - What are good, reliable databases of atomic spectra?

I am looking for a database of atomic spectra, which contains

• atomic levels and their energies, electronic configurations, angular-momentum characteristics and lifetimes, and


• atomic transitions and their energies, initial and final states, linewidths and branching ratios,

and that kind of data, ideally for a broad range of neutral atoms and ions covering the full periodic table.

Ideally, I'm looking for reliable databases which do not have intermittent service interruptions, though databases from countries with intermittent service are also OK.