According to "Welt", companies active in construction, rail infrastructure, digitalization and the energy industry are considered to be beneficiaries of the debt pact. So-called green sectors are also likely to benefit.
A few examples:
$FAST (+1.63%) - Fastned
$ACC (-6.79%) - Aker Corp
$IOS (+2.51%) - Ionos
$KTN (+3.34%) - Kontron
$NDX1 (+0.24%) - Nordex
$BC8 (+2.74%) - Bechtle
$VOS (+1.16%) - Vossloh
$S92 (+3.45%) - SMA Solar

Despite all the debt euphoria, however, investors should bear in mind that the infrastructure companies are smaller stocks that are not without risk.
Source (excerpt) & chart: World