Vagrantless (draft), tested on OS X only.

vagrant up example

# Here is an example what Vagrant produces to create new VM

/usr/bin/VBoxManage list hostonlyifs
/usr/bin/VBoxManage import -n ~/.vagrant.d/boxes/ubuntu1204/virtualbox/box.ovf
/usr/bin/VBoxManage import ~/.vagrant.d/boxes/ubuntu1204/virtualbox/box.ovf --vsys 0 --vmname 'test_1383128976_1388771771625_2328' --vsys 0 --unit 10 --disk '~/VirtualBox \VMs/test_1383128976_1388771771625_2328/box-disk1.vmdk'
/usr/bin/VBoxManage list vms

/usr/bin/VBoxManage showvminfo c613294b-5258-45ba-a1af-cd908cb11ddf
/usr/bin/VBoxManage modifyvm c613294b-5258-45ba-a1af-cd908cb11ddf --macaddress1 080027D0180B
/usr/bin/VBoxManage list hostonlyifs
/usr/bin/VBoxManage modifyvm c613294b-5258-45ba-a1af-cd908cb11ddf --name test2_default_1388771785554_78815
/usr/bin/VBoxManage sharedfolder add c613294b-5258-45ba-a1af-cd908cb11ddf --name /vagrant --hostpath ~/Desktop/test
/usr/bin/VBoxManage setextradata c613294b-5258-45ba-a1af-cd908cb11ddf 'VBoxInternal2/SharedFoldersEnableSymlinksCreate//vagrant' 1
/usr/bin/VBoxManage modifyvm c613294b-5258-45ba-a1af-cd908cb11ddf --nic2 none --nic3 none --nic4 none --nic5 none --nic6 none --nic7 none --nic8 none
/usr/bin/VBoxManage modifyvm c613294b-5258-45ba-a1af-cd908cb11ddf --nic1 nat
/usr/bin/VBoxManage modifyvm c613294b-5258-45ba-a1af-cd908cb11ddf --natpf1 'ssh,tcp,127.0.0.1,2222,,22'
/usr/bin/VBoxManage storagectl c613294b-5258-45ba-a1af-cd908cb11ddf --name 'SATA Controller' --hostiocache on
/usr/bin/VBoxManage modifyvm c613294b-5258-45ba-a1af-cd908cb11ddf --rtcuseutc on
/usr/bin/VBoxManage modifyvm c613294b-5258-45ba-a1af-cd908cb11ddf --natdnsproxy1 on

/usr/bin/VBoxManage startvm c613294b-5258-45ba-a1af-cd908cb11ddf --type headless

Vagrantless

# This the bash script to handle up-and-runnig VM created through Vagrant
#!/usr/bin/env bash


# PRIVATE: error level message
error_message () {
  echo "$(tput setaf 1)ERROR: $1$(tput sgr0)"
}


# PRIVATE: info level message
info_message () {
  echo "$(tput setaf 2)INFO: $1$(tput sgr0)"
}


if [ -z "$1" ]; then
  echo "Vagrantless syntax:
  Vagrantless up <uuid>
  Vagrantless stop <uuid>
  Vagrantless status [<uuid>]
  Vagrantless ssh <uuid>
  "
  exit 1
else
  vagrantVMs=$(find .vagrant -type f -name 'id' | while read line; do cat "${line}"; echo; done)
fi


if [ ! -z "$2" ]; then
  vm=$(VBoxManage list vms | grep -F "$vagrantVMs" | grep -F "$2")
  runningvm=$(VBoxManage list runningvms | grep -F "$vagrantVMs" | grep -F "$2")
  if [ "$vm" ]; then
    vmname=$(echo $vm | awk '{ print $1 }' | sed "s/\"//g")
  fi
fi


################################
# ./Vagrantless up VM
################################
if [ "$1" == "up" ]; then
  if [ ! -z "$2" ]; then

    if [ "$runningvm" ]; then
      error_message "This VM is running already. Do nothing."
    elif [ "$vm" ]; then
      info_message "This VM is available. It's going to start..."
      VBoxManage startvm $vmname --type headless
    else
      error_message "This VM is not available yet."
    fi

  else
    error_message "Please specify correct VM first."
  fi
fi


################################
# ./Vagrantless stop VM
################################
if [ "$1" == "stop" ]; then
  if [ ! -z "$2" ]; then
    if [ "$runningvm" ]; then
      info_message "This VM is available. Let's stop it..."
      VBoxManage controlvm $vmname poweroff
    else
      error_message "This VM is not running or not available."
    fi

  else
    error_message "Please specify correct VM first."
  fi
fi


################################
# ./Vagrantless status [VM]
################################
if [ "$1" == "status" ]; then
  if [ ! -z "$2" ]; then

    if [ "$vm" ]; then
      info_message "This VM is available."
      VBoxManage showvminfo $vname | grep State
    else
      error_message "Please specify correct VM first."
    fi

  fi
fi


################################
# ./Vagrantless ssh VM
################################
if [ "$1" == "ssh" ]; then
  if [ ! -z "$2" ]; then

    if [ "$runningvm" ]; then
      info_message "This VM is available. Let's SSH it."
      # Hard-coded IP address
      IP=192.168.1.7
      ssh -oStrictHostKeyChecking=no root@$IP
    else
      error_message "Please specify correct VM first."
    fi

  else
    error_message "Please specify correct VM first."
  fi
fi


echo ""
echo "$(tput setaf 2)---- Available VMs:$(tput setaf 4)"
VBoxManage list vms | grep -F "$vagrantVMs" | sed -n 's/\(.*\)\(_\)\(.*\)\(_\)\(.*\)\ /\3 /p'
echo "$(tput setaf 2)---- Running VMs:$(tput setaf 7)"
VBoxManage list runningvms | grep -F "$vagrantVMs" | sed -n 's/\(.*\)\(_\)\(.*\)\(_\)\(.*\)\ /\3 /p'