There are some frontends available, but they all suck, are no longer maintained or are hard to install.

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As a surprisingly comfortable alternative I have found a command line tool s3cmd:

sudo apt-get install s3cmd

When you run s3cmd the first time it will ask you for your access key ID and secret access key. This information is cached somewhere so you only need to write them once. To reconfigure later, call s3cmd --configure.

Once you're done setting up, s3cmd gives you shell-like commands like s3cmd ls or s3cmd del somefile.png.

Here is a full list of commands it understands:

  Make bucket
      s3cmd mb s3://BUCKET
  Remove bucket
      s3cmd rb s3://BUCKET
  List objects or buckets
      s3cmd ls [s3://BUCKET[/PREFIX]]
  List all object in all buckets
      s3cmd la 
  Put file into bucket
      s3cmd put FILE [FILE...] s3://BUCKET[/PREFIX]
  Get file from bucket
      s3cmd get s3://BUCKET/OBJECT LOCAL_FILE
  Delete file from bucket
      s3cmd del s3://BUCKET/OBJECT
  Delete file from bucket (alias for del)
      s3cmd rm s3://BUCKET/OBJECT
  Restore file from Glacier storage
      s3cmd restore s3://BUCKET/OBJECT
  Synchronize a directory tree to S3 (checks files freshness using size and md5 checksum, unless overridden by options, see below)
      s3cmd sync LOCAL_DIR s3://BUCKET[/PREFIX] or s3://BUCKET[/PREFIX] LOCAL_DIR
  Disk usage by buckets
      s3cmd du [s3://BUCKET[/PREFIX]]
  Get various information about Buckets or Files
      s3cmd info s3://BUCKET[/OBJECT]
  Copy object
      s3cmd cp s3://BUCKET1/OBJECT1 s3://BUCKET2[/OBJECT2]
  Modify object metadata
      s3cmd modify s3://BUCKET1/OBJECT
  Move object
      s3cmd mv s3://BUCKET1/OBJECT1 s3://BUCKET2[/OBJECT2]
  Modify Access control list for Bucket or Files
      s3cmd setacl s3://BUCKET[/OBJECT]
  Modify Bucket Policy
      s3cmd setpolicy FILE s3://BUCKET
  Delete Bucket Policy
      s3cmd delpolicy s3://BUCKET
  Modify Bucket CORS
      s3cmd setcors FILE s3://BUCKET
  Delete Bucket CORS
      s3cmd delcors s3://BUCKET
  Modify Bucket Requester Pays policy
      s3cmd payer s3://BUCKET
  Show multipart uploads
      s3cmd multipart s3://BUCKET [Id]
  Abort a multipart upload
      s3cmd abortmp s3://BUCKET/OBJECT Id
  List parts of a multipart upload
      s3cmd listmp s3://BUCKET/OBJECT Id
  Enable/disable bucket access logging
      s3cmd accesslog s3://BUCKET
  Sign arbitrary string using the secret key
      s3cmd sign STRING-TO-SIGN
  Sign an S3 URL to provide limited public access with expiry
      s3cmd signurl s3://BUCKET/OBJECT <expiry_epoch|+expiry_offset>
  Fix invalid file names in a bucket
      s3cmd fixbucket s3://BUCKET[/PREFIX]
  Create Website from bucket
      s3cmd ws-create s3://BUCKET
  Delete Website
      s3cmd ws-delete s3://BUCKET
  Info about Website
      s3cmd ws-info s3://BUCKET
  Set or delete expiration rule for the bucket
      s3cmd expire s3://BUCKET
  Upload a lifecycle policy for the bucket
      s3cmd setlifecycle FILE s3://BUCKET
  Remove a lifecycle policy for the bucket
      s3cmd dellifecycle s3://BUCKET
  List CloudFront distribution points
      s3cmd cflist 
  Display CloudFront distribution point parameters
      s3cmd cfinfo [cf://DIST_ID]
  Create CloudFront distribution point
      s3cmd cfcreate s3://BUCKET
  Delete CloudFront distribution point
      s3cmd cfdelete cf://DIST_ID
  Change CloudFront distribution point parameters
      s3cmd cfmodify cf://DIST_ID
  Display CloudFront invalidation request(s) status
      s3cmd cfinvalinfo cf://DIST_ID[/INVAL_ID]