Yes, both Seva and Algolia Site Search offer a Free Trial.
Seva is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Algolia Site Search is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Seva Starts at $12/User/Month when Billed Yearly whereas for Algolia Site Search Starts at $29/Month.
Some top alternatives to Seva includes Algolia Site Search, Sajari, Searchbar, Guru, SmartSupport, ISELO, IntelligenceBank KM, HuForce, Whatis and ProProfs Knowledge Base.
Some top alternatives to Algolia Site Search includes Site Search 360, Swiftype Search, Datafari, SearchBlox Search, AddSearch, Elasticsearch, Sajari, Searchanise, Searchbar and Zevi.