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What's a decent Delphi (Object Pascal) IDE for *nix?

Lazarus and Free Pascal are the free and open source alternatives to Delphi. There's also FMXLinux:

Source: I'm a satisfied user of Delphi, but only currently uses Professional and haven't tried out FMXLinux yet.

Lazarus is great.

Yes. Example small app I created using it: Digital Clock created in FreePascal / Lazarus: