Hereís an odd thing: Picasa shouldnít exist. Google announced its retirement earlier this year, but like a detective who canít retire while his nemeses are still doing crimes, Picasa is still around to tame your photo libraries.
Itís available for both Windows and Mac, although it wonít be updated now that Google has turned its attention to its newer Google Photos product. The selling point of Google+ integration isnít what it was either, but thatís not to say that Picasa isnít worth a place on your desktop.
Why you need it
It might not be Googleís favourite thing any more, but in its day Picasa was head and shoulders above most other free photo organisers: it was fast, offered useful facial recognition, made online storage simple, and included a whole host of decent camera effects. And thatís still true today, apart from the online component (Picasa Web Albums), which is no longer available.
If thatís not a deal-breaker thereís still plenty to like here including geotagging and text overlays, the excellent Fill Light tool to improve darker shots and its effective blemish removal tool.