The best replacement for uuencode is base64.

The best alternatives to uuencode are rated as following:
★★★★★  base64
★★★★  mime
★★  xxencode
★★  binhex
  base 64

Your alternative for uuencode is not listed? Suggest!
Speaking about uuencode, one probably shouldn't forget about mailx command.

Other search terms related to uuencode and their ratings are:
★★★★★ mailx command
★★★★★ attachment
★★★★ multiple attachments
★★★ mailx
You have in mind a companion for uuencode and it is not yet here? Propose!



Google Trends

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uuencode
base64
mime