Tropica used to have a great search function with multiple parameter optrions. When you added "brackish tolerant", it gave you this list:
Aponogeton crispus
Bacopa monnieri
Cladophora aegagrophila
Crinum calamistratum
Crinum natans
Crinum thaianum
Cryptocoryne pontederiifolia
Cryptocoryne wendtii 'Mi Oya'
Glossostigma elatinoides
Lilaeopsis brasiliensis
Microsorum pteropus 'Narrow'
Nymphaea lotus (zenkeri)
Samolus valerandi
Taxiphyllum barbieri (Vesicularia)
Happy experimenting!
Aponogeton crispus
Bacopa monnieri
Cladophora aegagrophila
Crinum calamistratum
Crinum natans
Crinum thaianum
Cryptocoryne pontederiifolia
Cryptocoryne wendtii 'Mi Oya'
Glossostigma elatinoides
Lilaeopsis brasiliensis
Microsorum pteropus 'Narrow'
Nymphaea lotus (zenkeri)
Samolus valerandi
Taxiphyllum barbieri (Vesicularia)
Happy experimenting!